IA: Individual County Chronologies

ADAIR created from POTTAWATTAMIE and Non-County Area 3 attached to MAHASKA; ADAIR not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 2/p. 27)

ADAIR attached to CASS "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 10/p. 23)

ADAIR fully organized, detached from CASS. (Swisher, "Organization of Counties," 574)

ADAMS created from POTTAWATTAMIE; ADAMS not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 3/pp. 27-28)

ADAMS fully organized; MONTGOMERY attached to ADAMS "for election, revenue, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 8, 11/p. 23)

MONTGOMERY fully organized, detached from ADAMS. (Swisher, "Organization of Counties," 575)

ALLAMAKEE created from Non-County Area 10; Non-County-Area 10 eliminated. ALLAMAKEE not fully organized, not attached. (Iowa Acts 1846-1847, ch. 66, secs. 1-2/p. 75)

ALLAMAKEE fully organized. (Iowa Acts 1848-1849, ch. 111, sec. 1/pp. 415-417)

APPANOOSE created by Iowa Territory from Non-County Area 5 attached to VAN BUREN; APPANOOSE not fully organized, attached to VAN BUREN "for judicial, revenue, and election purposes". (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 2/p. 132)

APPANOOSE detached from VAN BUREN, attached to DAVIS "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 122, secs. 1, 11, 13/pp. 137-139)

APPANOOSE fully organized, detached from DAVIS; DECATUR and WAYNE attached to APPANOOSE "for election, revenue, and judicial purposes"; Non-County Area 5 detached from DAVIS, attached to APPANOOSE "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 60, secs. 1, 15/pp. 55-58)

APPANOOSE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

APPANOOSE lost all of attached Non-County Area 5 to creation of FREMONT, PAGE, RINGGOLD, and TAYLOR; Non-County Area 5 eliminated. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Missouri implicitly overlapped APPANOOSE when it claimed, before the U.S. Supreme Court, a state boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of APPANOOSE ended when the U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

DECATUR fully organized, detached from APPANOOSE. (Swisher, "Organization of Counties," 574)

WAYNE fully organized, detached from APPANOOSE. (Swisher, "Organization of Counties," 576)

AUDUBON created from POTTAWATTAMIE and Non-County Area 11 attached to DALLAS; AUDUBON not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 18/p. 31)

AUDUBON lost to GUTHRIE. (Iowa Acts, 1850-1851, ch. 81, sec. 1/pp. 194-195)

AUDUBON attached to CASS "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 10/p. 23)

AUDUBON fully organized, detached from CASS. (Swisher, "Organization of Counties," 574)

BANCROFT (extinct) created from Non-County Area 9 attached to POLK; BANCROFT not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 46/p. 37)

BANCROFT (extinct) attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

BANCROFT (extinct) lost all territory to KOSSUTH; BANCROFT eliminated. (Iowa Acts 1854-1855, ch. 141, secs. 1-2/p. 210)

Legislature authorized creation of BELKNAP (proposed) from POTTAWATTAMIE, dependent on local referendum that failed; BELKNAP was never created. (Garver, "Establishment of Counties," 433; Iowa Acts 1874, priv., ch. 23, secs. 1-4/pp. 19-21)

BENTON created by Wisconsin Territory from DUBUQUE; BENTON not fully organized, attached to JACKSON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 10-11/p. 135)

BENTON became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

BENTON detached from JACKSON, attached to LINN "for judicial, election, and revenue purposes." (Iowa Terr. Laws 1840-1841, ch. 3, sec. 1/p. 4)

BENTON lost to creation of TAMA and Non-County Area 7; BENTON remained attached to LINN. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 10/pp. 133-134)

BENTON fully organized, detached from LINN; BLACK HAWK detached from DELAWARE, attached to BENTON "for election, judicial, and revenue purposes"; TAMA detached from LINN, attached to BENTON "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88)

BENTON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

BLACK HAWK detached from BENTON, attached to BUCHANAN "for judicial, elective, and revenue purposes". (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

TAMA fully organized, detached from BENTON. (Swisher, "Organization of Counties," 576)

Boundary between BENTON and TAMA confirmed [no change]. (Iowa Acts 1858, ch. 123, sec. 1/pp. 240-241)

BLACK HAWK created by Iowa Territory from BUCHANAN. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

BLACK HAWK attached to DELAWARE for administrative and judicial purposes. (Iowa Terr. Laws 1843-1844, ch. 87, sec. 2/p. 105)

BLACK HAWK detached from DELAWARE, attached to BENTON "for election, judicial, and revenue purposes". (Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88)

BLACK HAWK became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

BLACK HAWK detached from BENTON, attached to BUCHANAN "for judicial, elective, and revenue purposes". (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

BREMER, BUTLER, and GRUNDY detached from BUCHANAN, attached to BLACK HAWK "for judicial, elective, and revenue purposes." (Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86)

BREMER fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 574)

BLACK HAWK fully organized, detached from BUCHANAN. (Swisher, "Organization of Counties," 574)

BUTLER fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 574)

GRUNDY fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 575)

BOONE created by Iowa Territory from Non-County Area 7 attached to LINN; BOONE not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74)

BOONE attached to POLK "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

BOONE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

BOONE fully organized, detached from POLK. (Swisher, "Organization of Counties," 574-575)

BANCROFT, EMMET, FOX (renamed CALHOUN), HANCOCK, HUMBOLDT, KOSSUTH, PALO ALTO, POCAHONTAS, WINNEBAGO, WEBSTER and WRIGHT attached to BOONE for administrative and judicial purposes. STORY detached from POLK, attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, secs. 1, 4/p. 28; ch 52, sec. 1/pp. 87-88)

STORY fully organized, detached from BOONE. (Swisher, "Organization of Counties," 576)

WEBSTER fully organized, detached from BOONE. (Swisher, "Organization of Counties," 576)

CALHOUN detached from BOONE, attached to GREENE; EMMET, HANCOCK, KOSSUTH, PALO ALTO, POCAHONTAS, WINNEBAGO, and WRIGHT detached from BOONE, attached to WEBSTER. All attachments were "for election, judicial, and revenue purposes." BANCROFT and HUMBOLDT eliminated this date; ending their attachments to BOONE. (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

STORY authorized to gain the parts of the town of Sheldahl located in BOONE and POLK, dependent upon local referendum that failed [no change]. (Garver, "Establishment of Counties," 434; Iowa Acts 1880, ch. 197, secs. 1-3/pp. 191-192)

BREMER created from Non-County Area 6 attached to DELAWARE; BREMER not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 8/p. 29)

BREMER attached to BUCHANAN "for judicial, elective, and revenue purposes." (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

BREMER detached from BUCHANAN, attached to BLACK HAWK "for judicial, elective, and revenue purposes" (BREMER remained indirectly attached to BUCHANAN, through BLACK HAWK, until 15 August 1853). (Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86)

BREMER fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 574)

BUCHANAN created by Wisconsin Territory from DUBUQUE; BUCHANAN not fully organized, attached to DUBUQUE "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 5-6/p. 134)

BUCHANAN became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

BUCHANAN lost to creation of BLACK HAWK and Non-County Area 6 attached to DELAWARE; BUCHANAN remained attached to DUBUQUE. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

BUCHANAN detached from DUBUQUE, attached to DELAWARE for administrative and judicial purposes. (Iowa Terr. Laws 1843-1844, ch. 87, sec. 2/p. 105)

BUCHANAN became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

BUCHANAN fully organized, detached from DELAWARE. (Swisher, "Organization of Counties," 574)

BLACK HAWK detached from BENTON, attached to BUCHANAN "for judicial, elective, and revenue purposes"; BREMER, BUTLER, and GRUNDY attached to BUCHANAN "for judicial, elective, and revenue purposes." (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

BREMER, BUTLER, and GRUNDY detached from BUCHANAN, attached to BLACK HAWK "for judicial, elective, and revenue purposes" (BREMER remained indirectly attached to BUCHANAN, through BLACK HAWK, until 15 August 1853, and BUTLER and GRUNDY remained indirectly attached to BUCHANAN, through BLACK HAWK, until 17 August 1853). (Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86)

BLACK HAWK fully organized, detached from BUCHANAN. (Swisher, "Organization of Counties," 574)

BUENA VISTA created from Non-County Area 9 attached to POLK; BUENA VISTA not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 30/p. 34)

BUENA VISTA attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

BUENA VISTA fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 574)

BUENA VISTA attached to CLAY "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

BUENA VISTA fully organized, detached from CLAY when judicial attachments of 30 March 1864 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

BUTLER created from Non-County Area 6 attached to DELAWARE; BUTLER not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 9/p. 29)

BUTLER attached to BUCHANAN "for judicial, elective, and revenue purposes." (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

BUTLER detached from BUCHANAN, attached to BLACK HAWK "for judicial, elective, and revenue purposes" (BUTLER remained indirectly attached to BUCHANAN, through BLACK HAWK, until 17 August 1853). (Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86)

BUTLER fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 574)

FOX (now CALHOUN) created from Non-County Area 9 attached to POLK; FOX not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 20/p. 32)

FOX renamed CALHOUN; CALHOUN attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, secs. 1, 4/p. 28)

CALHOUN detached from BOONE, attached to GREENE "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

CALHOUN fully organized, detached from GREENE. (Swisher, "Organization of Counties," 574)

CARROLL created from POTTAWATTAMIE and Non-County Area 9 attached to POLK; CARROLL not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 18/pp. 31-32)

CARROLL attached to SHELBY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 13/p. 23)

CARROLL detached from SHELBY, attached to GUTHRIE "for judicial, election, and revenue purposes." (Iowa Acts 1854-1855, ch. 8, secs. 1-2/pp. 6-7)

CARROLL fully organized, detached from GUTHRIE. (Swisher, "Organization of Counties," 574)

CASS created from POTTAWATTAMIE; CASS not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 4/p. 28)

CASS fully organized; ADAIR and AUDUBON attached to CASS "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, secs. 8, 10/p. 23)

ADAIR fully organized, detached from CASS. (Swisher, "Organization of Counties," 574)

AUDUBON fully organized, detached from CASS. (Swisher, "Organization of Counties," 574)

CEDAR created by Wisconsin Territory from DUBUQUE; JOHNSON and KEOKUK attached to CEDAR "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, sec. 13/p. 135)

CEDAR became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

JOHNSON fully organized, detached from CEDAR; KEOKUK detached from CEDAR, attached to JOHNSON "for judicial purposes." (History of Johnson, 172; Wis. Terr. Laws 1838, spec. sess., no. 10, sec. 1/pp. 543-544)

CEDAR became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

CERRO GORDO created from Non-County Area 6 attached to DELAWARE and Non-County Area 9 attached to POLK; CERRO GORDO not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 35/p. 35)

CERRO GORDO attached to FLOYD "for judicial purposes". (Iowa Acts 1854-1855, ch. 111, sec. 5/p. 175)

CERRO GORDO's attachment to FLOYD expanded to include "election, revenue, and judicial purposes." (Iowa Acts 1854-1855, ch. 84, secs. 1, 3/p. 123)

CERRO GORDO fully organized, detached from FLOYD. (Swisher, "Organization of Counties," 574)

WORTH detached from MITCHELL, attached to CERRO GORDO "for judicial, election, and revenue purposes." (Iowa Acts 1858, ch. 47, secs. 1, 3/p. 53)

WORTH fully organized, detached from CERRO GORDO. (Iowa Acts 1858, ch. 144, secs. 1-2/pp. 284-285; Swisher, "Organization of Counties," 576)

CHEROKEE created from Non-County Area 9 attached to POLK; CHEROKEE not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 31/pp. 34-35)

CHEROKEE attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

CHEROKEE fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 574)

CHEROKEE attached to CLAY "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

CHEROKEE fully organized, detached from CLAY; O'BRIEN detached from CLAY, attached to CHEROKEE "for judicial purposes". (Iowa Acts 1868, ch. 73, secs. 2, 8/pp. 99-100)

O'BRIEN fully organized, detached from CHEROKEE when judicial attachments of 7 April 1868 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

CHICKASAW created from Non-County Area 6 attached to DELAWARE; CHICKASAW not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 33/p. 35)

CHICKASAW attached to FAYETTE "for election, revenue, and judicial purposes"; FLOYD, FRANKLIN, HOWARD, MITCHELL, and WORTH attached to CHICKASAW for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, secs. 1, 8/pp. 28-29)

CHICKASAW fully organized, detached from FAYETTE. (Swisher, "Organization of Counties," 574)

FLOYD fully organized, detached from CHICKASAW. (Swisher, "Organization of Counties," 575)

MITCHELL fully organized, detached from CHICKASAW. (Iowa Acts 1854-1855, ch. 113, sec. 1/p. 176; Swisher, "Organization of Counties," 575)

CHICKASAW lost to HOWARD; FRANKLIN detached from CHICKASAW, attached to HARDIN "for election, judicial, and revenue purposes." (Iowa Acts 1854-1855, ch. 120, secs. 1-2/pp. 185-186; ch. 142, sec. 1/p. 211)

HOWARD and WORTH detached from CHICKASAW, attached to FLOYD "for judicial purposes". (Iowa Acts 1854-1855, ch. 111, sec. 5/p. 175)

CLARK (Mo.) expanded by Missouri legislature into area claimed by Iowa Territory, overlapping VAN BUREN and creating a dispute finally settled in Iowa's favor by U.S. Supreme Court in 1849. (Mo. Laws 1838, p. 22)

CLARKE created by Iowa Territory from Non-County Area 4 attached to KISHKEKOSH (now MONROE); CLARKE not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 2, 11/pp. 73-75)

CLARKE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

CLARKE gained from LUCAS, lost to Non-County Area 4 attached to MONROE. (Iowa Acts 1848-1849, ch. 9, secs. 1-2/pp. 332-333)

CLARKE fully organized. (Swisher, "Organization of Counties," 574)

CLAY created from Non-County Area 9 attached to POLK; CLAY not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 39/p. 36)

CLAY attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

CLAY fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 574)

BUENA VISTA, CHEROKEE, and O'BRIEN attached to CLAY "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

CHEROKEE fully organized, detached from CLAY; O'BRIEN detached from CLAY, attached to CHEROKEE "for judicial purposes". (Iowa Acts 1868, ch. 73, secs. 2, 8/pp. 99-100)

BUENA VISTA fully organized, detached from CLAY when judicial attachments of 30 March 1864 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

CLAYTON created by Wisconsin Territory from DUBUQUE; FAYETTE attached to CLAYTON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, sec. 1/p. 133)

CLAYTON became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

FAYETTE attachment to CLAYTON reduced when FAYETTE lost substantial territory to Non-County Area 6. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

CLAYTON became an Iowa county when the state of Iowa was created from Iowa Territory. FAYETTE attachment to CLAYTON reduced further when FAYETTE lost all area north of present state boundary [attachment unchanged]. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

CLAYTON gained from FAYETTE, lost to Non-County Area 10; FAYETTE remained attached to CLAYTON. (Iowa Acts 1846-1847, ch. 23, secs. 1-2/pp. 39-40)

FAYETTE fully organized, detached from CLAYTON. (Swisher, "Organization of Counties," 575)

CLINTON created by Wisconsin Territory from DUBUQUE; CLINTON not fully organized, attached to SCOTT "until otherwise directed by law." (Wis. Terr. Laws 1837, no. 6, secs. 12, 20/pp. 135, 137)

CLINTON became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

CLINTON fully organized, detached from SCOTT. (Iowa Terr. Laws 1839-1840, ch. 39, sec. 1/pp. 67-68)

CLINTON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

COOK (extinct) created by Wisconsin Territory from DES MOINES; COOK not fully organized, attached to MUSCATINE "for all judicial purposes." (Wis. Terr. Laws 1836, no. 21, secs. 7, 9/pp. 77-78)

COOK (extinct) lost to creation of JOHNSON and SCOTT [attachment unchanged]. (Wis. Terr. Laws 1837, no. 6, secs. 14, 16, 17-19/pp. 135-137)

COOK (extinct) lost all territory to MUSCATINE; COOK eliminated. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

CRAWFORD created from POTTAWATTAMIE and Non-County Area 9 attached to POLK; CRAWFORD not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 22/p. 32)

CRAWFORD attached to SHELBY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 13/p. 23)

CRAWFORD fully organized, detached from SHELBY. (Swisher, "Organization of Counties," 574)

[c. 10 October 1865] CRAWFORD gained from MONONA. (Crawford County Supervisors records, Book 1:309; Garver, "Establishment of Counties," 430)

CROCKER (extinct) created from KOSSUTH. (Iowa Acts 1870, ch. 192, secs. 1, 5/pp. 239-240)

CROCKER lost all territory to KOSSUTH when the state supreme court ruled the act creating CROCKER was unconstitutional; CROCKER eliminated. (Garver, "Establishment of Counties," 431-432; Iowa Reports 33:16-20)

DALLAS created by Iowa Territory from Non-County Area 8 attached to MAHASKA; DALLAS not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 3-4, 6, 9-10/pp. 74-75)

DALLAS gained from Non-County Area 8 attached to MAHASKA; lost to POLK. (Iowa Terr. Laws 1845-1846, ch. 83, secs. 1-3/pp. 75-76)

DALLAS attached to POLK "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

DALLAS became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Non-County Area 11 attached to DALLAS "for election, revenue, and judicial purposes." Non-County Area 11 was in two parts. (Iowa Acts 1846-1847, ch. 50, secs. 1, 10, 17/pp. 61-62)

DALLAS lost all of attached Non-County Area 11 to creation of AUDUBON, GUTHRIE, HARRISON, and SHELBY; Non-County Area 11 eliminated. GUTHRIE overlapped part of DALLAS creating a jurisdictional dispute that was settled 5 February 1851. (Iowa Acts 1850-1851, ch. 9, secs. 17-18, 23-24/pp. 31-33)

DALLAS gained undisputed jurisdiction of the area overlapped by GUTHRIE on 15 January 1851 [no change]. (Iowa Acts, 1850-1851, ch. 81, sec. 1/pp. 194-195)

DALLAS boundaries defined [no change]. (Iowa Acts 1852-1853, ch. 33, sec. 1/p. 65)

GREENE attached to DALLAS for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

GREENE fully organized, detached from DALLAS. (Swisher, "Organization of Counties," 575)

DAVIS created by Iowa Territory from Non-County Area 5 attached to VAN BUREN; DAVIS not fully organized, attached to VAN BUREN "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 1-2/pp. 131-132)

DAVIS fully organized, detached from VAN BUREN; APPANOOSE and Non-County Area 5 detached from VAN BUREN, attached to DAVIS "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 122, secs. 1, 11, 13/pp. 137-139)

Non-County Area 5 attached to DAVIS lost to creation of DECATUR and WAYNE. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 1, 12/pp. 73-75)

APPANOOSE fully organized, detached from DAVIS; Non-County Area 5 detached from DAVIS, attached to APPANOOSE "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 60, secs. 1, 15/pp. 55-58)

DAVIS became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Missouri implicitly overlapped DAVIS when it claimed, before the U.S. Supreme Court, a state boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of DAVIS ended when the U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

DECATUR created by Iowa Territory from Non-County Area 5 attached to DAVIS; DECATUR not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 1, 12/pp. 73-75)

DECATUR attached to APPANOOSE "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 60, sec. 15/p. 57)

DECATUR became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Missouri implicitly overlapped DECATUR when it claimed, before the U.S. Supreme Court, a boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of DECATUR ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

DECATUR fully organized, detached from APPANOOSE. (Swisher, "Organization of Counties," 574)

DELAWARE created by Wisconsin Territory from DUBUQUE; DELAWARE not fully organized, attached to DUBUQUE "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 4, 6/pp. 133-134)

DELAWARE became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

DELAWARE fully organized, detached from DUBUQUE. (Iowa Terr. Laws 1839-1840, ch. 7, secs. 1, 5/pp. 10-12)

DELAWARE reattached to DUBUQUE "for judicial purposes." (Iowa Terr. Laws 1842-1843, ch. 57, sec. 1/p. 54)

Non-County Area 6 attached to DELAWARE "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

DELAWARE fully organized, detached from DUBUQUE; BLACK HAWK attached to DELAWARE for administrative and judicial purposes; BUCHANAN detached from DUBUQUE, attached to DELAWARE for administrative and judicial purposes. (Iowa Terr. Laws 1843-1844, ch. 87, sec. 2/p. 105)

Non-County Area 6 attached to DELAWARE gained part of Non-County Area 7 and lost to creation of Non-County Area 9. Non-County Area 6 included territory in present Iowa and Minnesota. (Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88; ch. 101, secs. 1, 11-12/pp. 92-95)

DELAWARE lost part of attached Non-County Area 6 to unorganized federal territory when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

BUCHANAN fully organized, detached from DELAWARE. (Swisher, "Organization of Counties," 574)

DELAWARE lost all of attached Non-County Area 6 to creation of BREMER, BUTLER, CERRO GORDO, CHICKASAW, FLOYD, FRANKLIN, GRUNDY, HARDIN, HOWARD, MITCHELL, and WORTH; Non-County Area 6 eliminated. (Iowa Acts 1850-1851, ch. 9, secs. 8-12/pp. 29-30, secs. 33-35/p.35, secs. 43-44/p. 37)

DES MOINES created by Michigan Territory from non-county area in present Iowa. (Mich. Terr. Laws, 3:1326-1327)

DES MOINES became a county in Wisconsin Territory when Wisconsin Territory was created from Michigan Territory. (Terr. Papers U.S., 27:41-52; U.S. Stat., vol. 5, ch. 54[1836]/pp. 10-16)

DES MOINES lost to creation of COOK (extinct), HENRY, LEE, LOUISA, MUSCATINE, and VAN BUREN. (Wis. Terr. Laws 1836, no. 21, secs. 1-2, 4-7, 9/pp. 76-78)

DES MOINES gained from LOUISA, exchanged with HENRY and LEE. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

DES MOINES became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

DES MOINES exchanged with LEE. (Iowa Terr. Laws 1838-1839, pp. 94-95)

DES MOINES became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

DICKINSON created from Non-County Area 9 attached to POLK; DICKINSON not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 48/p. 38)

DICKINSON attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

DICKINSON fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 574)

An overlap area was created between VAN BUREN and CLARK (Mo.) when the Missouri legislature expanded CLARK into the area claimed by Iowa Territory; dispute finally settled in Iowa's favor by the U.S. Supreme Court on 13 February 1849. (Mo. Laws 1838, p. 22)

Boundary dispute between Iowa and Missouri reached U.S. Supreme Court: dispute involved location of the rapids of the Des Moines River, from which point the boundary was to run due west. Missouri's interpretation put the boundary approximately 10 miles north of the present boundary (implicitly overlapping the Iowa counties of APPANOOSE, DAVIS, DECATUR, FREMONT, PAGE, RINGGOLD, TAYLOR, VAN BUREN, and WAYNE); Iowa argued for a line approximately 7 miles south of the present boundary (implicitly overlapping the Missouri counties of ATCHISON, CLARK, DODGE, HARRISON, MERCER, NODAWAY, PUTNAM, SCHUYLER, SCOTLAND, and non-county area attached to GENTRY and HARRISON). (Landers, 647; Thomas, 268-269)

U.S. Supreme Court settled boundary dispute between Iowa and Missouri by rejecting both states' claims, choosing instead the Indian boundary line run and marked by John C. Sullivan in 1816 (the commonly accepted boundary before the dispute arose and the present boundary between the two states). The decision ended Missouri's implicit overlap of APPANOOSE, DAVIS, DECATUR, FREMONT, PAGE, RINGGOLD, TAYLOR, VAN BUREN, and WAYNE, and Iowa's implicit overlap of the Missouri counties of ATCHISON, CLARK, DODGE, HARRISON, MERCER, NODAWAY, PUTNAM, SCHUYLER, SCOTLAND, and non-county area attached to GENTRY and HARRISON. (Landers, 647-648; Thomas, 269-270)

Disputed area created when GUTHRIE overlapped western four townships of DALLAS; jurisdictional dispute corrected in favor of Dallas on 5 February 1851. (Iowa Acts 1850-1851, ch. 9, secs. 17-18, 23-24/pp. 31-33)

DALLAS gained undisputed jurisdiction of 15 January 1851 overlap with GUTHRIE; Disputed Area eliminated. (Iowa Acts, 1850-1851, ch. 81, sec. 1/pp. 194-195)

DUBUQUE created by Michigan Territory from non-county area in present Iowa, Minnesota, and North and South Dakota. (Mich. Terr. Laws, 3:1326-1327)

DUBUQUE became a county in Wisconsin Territory when Wisconsin Territory was created from Michigan Territory. (Terr. Papers U.S., 27:41-52; U.S. Stat., vol. 5, ch. 54[1836]/pp. 10-16)

DUBUQUE lost to creation of BENTON, BUCHANAN, CEDAR, CLAYTON, CLINTON, DELAWARE, FAYETTE, JACKSON, JOHNSON, JONES, KEOKUK, LINN, and SCOTT. BUCHANAN and DELAWARE not fully organized, attached to DUBUQUE "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 1-20/pp. 133-137)

DUBUQUE became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

DELAWARE fully organized, detached from DUBUQUE. (Iowa Terr. Laws 1839-1840, ch. 7, secs. 1, 5/pp. 10-12)

DELAWARE reattached to DUBUQUE "for judicial purposes." (Iowa Terr. Laws 1842-1843, ch. 57, sec. 1/p. 54)

BUCHANAN attachment to DUBUQUE reduced when BUCHANAN lost substantial territory by boundary redefinition. Non-County Area 6 (former parts of BUCHANAN and FAYETTE) indirectly attached to DUBUQUE, through DELAWARE, until 8 February 1844. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

DELAWARE fully organized, detached from DUBUQUE; BUCHANAN detached from DUBUQUE, attached to DELAWARE for administrative and judicial purposes. (Iowa Terr. Laws 1843-1844, ch. 87, sec. 2/p. 105)

DUBUQUE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

EMMET created from Non-County Area 9 attached to POLK; EMMET not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 47/pp. 37-38)

EMMET attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

EMMET detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

EMMET fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

FAYETTE created by Wisconsin Territory from DUBUQUE; FAYETTE included territory in present Iowa, Minnesota, and North and South Dakota. FAYETTE not fully organized, attached to CLAYTON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, sec. 2/p. 133)

FAYETTE became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

FAYETTE lost to creation of Non-County Area 6; FAYETTE included territory in present Iowa and Minnesota and remained attached to CLAYTON. (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

FAYETTE lost to unorganized federal territory when the state of Iowa was created from Iowa Territory; FAYETTE was eliminated from present Minnesota and remained attached to CLAYTON. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

FAYETTE lost to CLAYTON and to creation of Non-County Area 10; FAYETTE remained attached to CLAYTON. (Iowa Acts 1846-1847, ch. 23, secs. 1-2/pp. 39-40)

FAYETTE fully organized, detached from CLAYTON. (Swisher, "Organization of Counties," 575)

CHICKASAW attached to FAYETTE "for election, revenue, and judicial purposes" (FLOYD, FRANKLIN, HOWARD, MITCHELL, and WORTH indirectly attached to FAYETTE, through CHICKASAW, until 12 September 1853). (Iowa Acts 1852-1853, ch. 12, sec. 8/p. 29)

CHICKASAW fully organized, detached from FAYETTE. (Swisher, "Organization of Counties," 574)

FLOYD created from Non-County Area 6 attached to DELAWARE; FLOYD not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 34/p. 35)

FLOYD attached to CHICKASAW for administrative and judicial purposes (FLOYD indirectly attached to FAYETTE, through CHICKASAW, until 12 September 1853). (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

FLOYD fully organized, detached from CHICKASAW. (Swisher, "Organization of Counties," 575)

FLOYD lost to MITCHELL. (Iowa Acts 1854-1855, ch. 120, sec. 2/p. 186)

CERRO GORDO attached to FLOYD "for judicial purposes"; HOWARD and WORTH detached from CHICKASAW, attached to FLOYD "for judicial purposes"; MITCHELL attached to FLOYD "for judicial purposes," although no evidence has been found that the attachment was effected and it has thus not been mapped. (Clyde and Dwelle, 1:17; History of Mitchell and Worth, 145, 148; Iowa Acts 1854-1855, ch. 111, secs. 5-6/pp. 174-175; Swisher, "Organization of Counties," 545-546)

CERRO GORDO's attachment to FLOYD expanded to include "election, revenue, and judicial purposes." (Iowa Acts 1854-1855, ch. 84, secs. 1, 3/p. 123)

HOWARD fully, organized, detached from FLOYD. (Swisher, "Organization of Counties," 575)

CERRO GORDO fully organized, detached from FLOYD. (Swisher, "Organization of Counties," 574)

WORTH detached from FLOYD, attached to MITCHELL "for judicial purposes." (Iowa Acts 1856-1857, ch. 56, secs. 2, 4/pp. 66-67)

FRANKLIN created from Non-County Area 6 attached to DELAWARE and Non-County Area 9 attached to POLK; FRANKLIN not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9;sec. 12/p. 30)

FRANKLIN attached to CHICKASAW for administrative and judicial purposes (FRANKLIN indirectly attached to FAYETTE, through CHICKASAW, until 12 September 1853). (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

FRANKLIN detached from CHICKASAW, attached to HARDIN "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

FRANKLIN fully organized, detached from HARDIN. (Swisher, "Organization of Counties," 575)

FREMONT created from Non-County Area 5 attached to APPANOOSE; FREMONT not fully organized, not attached. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Missouri implicitly overlapped FREMONT when it claimed, before the U.S. Supreme Court, a boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of FREMONT ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

FREMONT fully organized. (Swisher, "Organization of Counties," 575)

GREENE created from Non-County Area 9 attached to POLK; GREENE not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 16/p. 31)

GREENE attached to DALLAS for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

GREENE fully organized, detached from DALLAS. (Swisher, "Organization of Counties," 575)

CALHOUN detached from BOONE, attached to GREENE "for election, judicial, and revenue purposes."; SAC detached from WOODBURY, attached to GREENE "for election, judicial, and revenue purposes". (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

CALHOUN fully organized, detached from GREENE. (Swisher, "Organization of Counties," 574)

SAC fully organized, detached from GREENE. (Swisher, "Organization of Counties," 576)

Legislature authorized creation of GRIMES (proposed) from POTTAWATTAMIE, dependent on local referendum that failed. GRIMES was never created; it had boundaries identical to BELKNAP (proposed), which failed to win approval in 1874. (Garver, "Establishment of Counties," 433-434; Iowa Acts 1876, ch. 160, secs. 1-4/pp. 156-159)

GRUNDY created from Non-County Area 6 attached to DELAWARE; GRUNDY not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 10/p. 29)

GRUNDY attached to BUCHANAN "for judicial, elective, and revenue purposes." (Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227)

GRUNDY detached from BUCHANAN, attached to BLACK HAWK "for judicial, elective, and revenue purposes" (but GRUNDY remained indirectly attached to BUCHANAN, through BLACK HAWK, until 17 August 1853) (Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86)

GRUNDY fully organized, detached from BLACK HAWK. (Swisher, "Organization of Counties," 575)

GUTHRIE created from Non-County Area 11 attached to DALLAS (overlapped western four townships of DALLAS, creating a jurisdictional dispute that was corrected 5 February 1851); GUTHRIE not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 17/p. 31)

GUTHRIE gained from AUDUBON and lost its claim to the area that overlapped DALLAS. (Iowa Acts, 1850-1851, ch. 81, sec. 1/pp. 194-195)

GUTHRIE fully organized. (Swisher, "Organization of Counties," 575)

CARROLL detached from SHELBY, attached to GUTHRIE "for judicial, election, and revenue purposes." (Iowa Acts 1854-1855, ch. 8, secs. 1-2/pp. 6-7)

CARROLL fully organized, detached from GUTHRIE. (Swisher, "Organization of Counties," 574)

HAMILTON created from WEBSTER. (Iowa Acts 1856-1857, ch. 15, secs. 1, 9/pp. 11-13)

HANCOCK created from Non-County Area 9 attached to POLK; HANCOCK not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 36/p. 35)

HANCOCK attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28 )

HANCOCK detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

HANCOCK fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

HARDIN created from Non-County Area 6 attached to DELAWARE and Non-County Area 9 attached to POLK; HARDIN not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 11/pp. 29-30)

HARDIN attached to MARSHALL for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28

HARDIN fully organized, detached from MARSHALL. (Swisher, "Organization of Counties," 575)

FRANKLIN detached from CHICKASAW, attached to HARDIN "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

FRANKLIN fully organized, detached from HARDIN. (Swisher, "Organization of Counties," 575)

HARRISON created from POTTAWATTAMIE and Non-County Area 11 attached to DALLAS; HARRISON not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 24/p. 33)

HARRISON fully organized; MONONA attached to HARRISON "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, secs. 8, 12/p. 23)

MONONA fully organized, detached from HARRISON. (Swisher, "Organization of Counties," 575)

HENRY created by Wisconsin Territory from DES MOINES. (Wis. Terr. Laws 1836, no. 21, sec. 4/pp.76-78)

HENRY gained from LOUISA, exchanged with DES MOINES, lost to creation of SLAUGHTER (now WASHINGTON) and Non-County Area 4, and lost to LEE and VAN BUREN; Non-County Area 4 attached to HENRY "for judicial purposes." (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

HENRY became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

HENRY lost to creation of JEFFERSON and lost part of attached Non-County Area 4 to creation of JEFFERSON; Non-County Area 4 remained attached to HENRY. (Iowa Terr. Laws 1838-1839, pp. 92-94)

HENRY lost part of attached Non-County Area 4 to creation of KISHKEKOSH (now MONROE) and WAPELLO; remaining part of Non-County Area 4 was detached from HENRY, attached to JEFFERSON. (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 3-4/p. 132)

HENRY became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

HOWARD (Mo.) created by Missouri Territory from ST. CHARLES (Mo.), ST. LOUIS (Mo.), and WASHINGTON (Mo.); HOWARD included part of present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 162/pp. 460-464)

HOWARD (Mo.) lost to non-county area and to creation of BOONE (Mo.), CHARITON (Mo.), and RAY (Mo.); HOWARD (Mo.) eliminated from present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 265/pp. 650-652, and ch. 267/pp. 655-661)

HOWARD created from Non-County Area 6 attached to DELAWARE; HOWARD not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 42/pp. 36-37)

HOWARD attached to CHICKASAW for administrative and judicial purposes (HOWARD indirectly attached to FAYETTE, through CHICKASAW, until 12 September 1853). (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

HOWARD gained from CHICKASAW; HOWARD remained attached to CHICKASAW. (Iowa Acts 1854-1855, ch. 120, secs. 1-2/pp. 185-186)

HOWARD detached from CHICKASAW, attached to FLOYD "for judicial purposes". (Clyde and Dwelle, 1:17; History of Mitchell and Worth, 145, 148; Iowa Acts 1854-1855, ch. 111, secs. 5-6/pp. 174-175; Swisher, "Organization of Counties," 545-546)

HOWARD fully, organized, detached from FLOYD. (Swisher, "Organization of Counties," 575)

HOWARD's organization as a county confirmed and legalized. (Iowa Acts 1856-1857, ch. 180, sec. 1/p. 271)

HUMBOLDT created from Non-County Area 9 attached to POLK; HUMBOLDT not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 28/p. 34)

HUMBOLDT attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

HUMBOLDT lost all territory to KOSSUTH and WEBSTER; HUMBOLDT eliminated. (Iowa Acts 1854-1855, ch. 141, secs. 1-2/p. 210)

HUMBOLDT re-created from KOSSUTH and WEBSTER. (Iowa Acts 1856-1857, ch. 147, secs. 1, 10/pp. 199-200)

HUMBOLDT gained from WEBSTER. (Iowa Acts 1858, ch. 42, secs. 1-2/pp. 49-50)

HUMBOLDT lost to WEBSTER when the state supreme court ruled the boundary change of 11 March 1858 unconstitutional. (Garver, "Establishment of Counties," 428-430; Iowa Reports, 12:1-14)

IDA created from Non-County Area 9 attached to POLK; IDA not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 26/p. 33)

IDA attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

IDA fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 575)

IDA attached to SAC "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

IDA fully organized, detached from SAC when judicial attachments of 30 March 1864 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

IOWA created by Iowa Territory from KEOKUK; POWESHIEK and Non-County Area 8 attached to IOWA "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-11/pp. 132-134)

IOWA attached to JOHNSON "for judicial, revenue, and election purposes"; POWESHIEK and Non-County Area 8 remained attached to IOWA. (Iowa Terr. Laws 1843-1844, ch. 4, secs. 1-2/p. 3)

POWESHIEK and Non-County Area 8 detached from IOWA, attached to MAHASKA "for election, revenue, and judicial purposes"; IOWA remained attached to JOHNSON. (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

IOWA fully organized, detached from JOHNSON. (Iowa Terr. Laws 1845, ch. 55, sec. 1/pp. 85-88)

IOWA became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

JACKSON created by Wisconsin Territory from DUBUQUE; BENTON, JONES, and LINN attached to JACKSON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, sec. 7/p. 134)

JACKSON became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

JONES and LINN fully organized, detached from JACKSON. (Iowa Terr. Laws 1838-1839, pp. 91-92, 95-96)

BENTON detached from JACKSON, attached to LINN "for judicial, election, and revenue purposes." (Iowa Terr. Laws 1840-1841, ch. 3, sec. 1/p. 4)

JACKSON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

JASPER created by Iowa Territory from Non-County Area 8 attached to MAHASKA; JASPER not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, sec. 6/p. 74)

JASPER gained from POLK. (Iowa Terr. Laws 1845-1846, ch. 83, secs. 1-3/pp. 75-76)

JASPER fully organized; MARSHALL attached to JASPER "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

JASPER became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MARSHALL fully organized, detached from JASPER. (Swisher, "Organization of Counties," 574-575)

JEFFERSON created by Iowa Territory from HENRY and Non-County Area 4 attached to HENRY. (Iowa Terr. Laws 1838-1839, pp. 92-94)

JEFFERSON gained from Non-County Area 4 attached to HENRY. KISHKEKOSH (now MONROE) and WAPELLO attached to JEFFERSON; Non-County Area 4 detached from HENRY, attached to JEFFERSON. All attachments were "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 3-4/p. 132)

WAPELLO fully organized, detached from JEFFERSON; KISHKEKOSH (now MONROE) and Non-County Area 4 detached from JEFFERSON, attached to WAPELLO "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 100, secs. 1, 16/pp. 114-117)

JEFFERSON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

JOHNSON created by Wisconsin Territory from COOK (extinct), DUBUQUE, MUSCATINE, and Non-County Area 1; JOHNSON not fully organized, attached to CEDAR "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 14, 16/pp. 135-136)

JOHNSON became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

JOHNSON fully organized, detached from CEDAR; KEOKUK detached from CEDAR, attached to JOHNSON "for judicial purposes." (History of Johnson, 172; Wis. Terr. Laws 1838, spec. sess., no. 10, sec. 1/pp. 543-544)

JOHNSON lost to WASHINGTON [attachment unchanged]. (Iowa Terr. Laws 1838-1839, pp. 100-101)

KEOKUK detached from JOHNSON, attached to WASHINGTON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 5/p. 132)

IOWA attached to JOHNSON "for judicial, revenue, and election purposes" (POWESHIEK and Non-County Area 8 indirectly attached to JOHNSON, through IOWA, until 1 March 1844) (Iowa Terr. Laws 1843-1844, ch. 4, secs. 1-2/p. 3)

JOHNSON gained from WASHINGTON [attachment unchanged]. (Iowa Terr. Laws 1845, ch. 45, sec. 1/pp. 66-67)

IOWA fully organized, detached from JOHNSON. (Iowa Terr. Laws 1845, ch. 55, sec. 1/pp. 85-88)

JOHNSON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

JONES created by Wisconsin Territory from DUBUQUE; JONES not fully organized, attached to JACKSON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 8, 11/pp. 134-135)

JONES became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

JONES fully organized, detached from JACKSON. (Iowa Terr. Laws 1838-1839, pp. 95-96)

JONES became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

KEOKUK created by Wisconsin Territory from DUBUQUE and Non-County Area 1; KEOKUK not fully organized, attached to CEDAR "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 15-16/p. 136)

KEOKUK became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

KEOKUK detached from CEDAR, attached to JOHNSON "for judicial purposes." (History of Johnson, 172; Wis. Terr. Laws 1838, spec. sess., no. 10, sec. 1/pp. 543-544)

KEOKUK lost to WASHINGTON [attachment unchanged]. (Iowa Terr. Laws 1838-1839, pp. 100-101)

KEOKUK lost to creation of IOWA, MAHASKA, POWESHIEK, and Non-County Area 8; exchanged with Non-County Area 3. KEOKUK detached from JOHNSON, attached to WASHINGTON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6, 8-11/pp. 132-134)

KEOKUK fully organized, detached from WASHINGTON. (Iowa Terr. Laws 1843-1844, ch. 68, sec. 1/p. 85)

KEOKUK became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

KOSSUTH created from Non-County Area 9 attached to POLK; KOSSUTH not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 37/pp. 35-36)

KOSSUTH attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28 )

KOSSUTH gained all of BANCROFT (extinct) and the northern half of HUMBOLDT; BANCROFT and HUMBOLDT eliminated. KOSSUTH detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts 1854-1855, ch. 141-142, secs. 1-2/pp. 210-211)

KOSSUTH fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

KOSSUTH lost to re-creation of HUMBOLDT. (Iowa Acts 1856-1857, ch. 147, secs. 1, 10/pp. 199-200)

KOSSUTH lost to creation of CROCKER (extinct). (Iowa Acts 1870, ch. 192, secs. 1, 5/pp. 239-240)

KOSSUTH gained all of CROCKER (extinct) when the state supreme court ruled the act creating CROCKER was unconstitutional; CROCKER eliminated. (Garver, "Establishment of Counties," 431-432; Iowa Reports 33:16-20)

Legislature authorized creation of LARRABEE (proposed) from KOSSUTH, dependent on local referendum that failed; LARRABEE was never created. (Iowa Acts 1913, ch. 344, secs. 1-4, 17/pp. 353-357)

LEE created by Wisconsin Territory from DES MOINES. (Wis. Terr. Laws 1836, no. 21, sec. 1/pp. 76-78)

LEE gained from HENRY, exchanged with DES MOINES. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

LEE became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

LEE exchanged with DES MOINES. (Iowa Terr. Laws 1838-1839, pp. 94-95)

Legislature authorized creation of MADISON (proposed) from LEE, dependent on local referendum that failed; county was never created. (History of Lee, 448; Iowa Terr. Laws 1843-1844, ch. 124, secs. 1, 9/pp. 142-144; Roberts and Moorhead, 1:55-59)

LINN created by Wisconsin Territory from DUBUQUE; LINN not fully organized, attached to JACKSON "for temporary purposes." (Wis. Terr. Laws 1837, no. 6, secs. 9, 11/pp. 134-135)

LINN became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

LINN fully organized, detached from JACKSON. (Iowa Terr. Laws 1838-1839, pp. 91-92)

BENTON detached from JACKSON, attached to LINN "for judicial, election, and revenue purposes." (Iowa Terr. Laws 1840-1841, ch. 3, sec. 1/p. 4)

TAMA and Non-County Area 7 attached to LINN "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6, 8-11/pp. 132-134)

LINN lost part of attached Non-County Area 7 to creation of MARSHALL, STORY. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/pp. 74)

Non-County Area 7 detached from LINN, became part of Non-County Areas 6 and 9. (Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88; ch. 101, secs. 1, 11-12/pp. 92-95)

LINN became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

LOUISA created by Wisconsin Territory from DES MOINES. (Wis. Terr. Laws 1836, no. 21, sec. 5/pp. 77-78)

LOUISA gained from MUSCATINE, lost to DES MOINES and HENRY, and lost to creation of SLAUGHTER (now WASHINGTON). (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

LOUISA became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

LOUISA gained from SLAUGHTER (now WASHINGTON). (Iowa Terr. Laws 1838-1839, pp. 89-91)

LOUISA became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

LUCAS created by Iowa Territory from Non-County Area 4 attached to KISHKEKOSH (now MONROE); LUCAS not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 2, 11/pp. 73-75)

LUCAS became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

LUCAS lost to CLARKE. (Iowa Acts 1848-1849, ch. 9, secs. 1-2/pp. 332-333)

LUCAS fully organized. (Iowa Acts 1848-1849, ch. 74, sec. 1/pp. 375-377)

BUNCOMBE (now LYON) created from Non-County Area 9 attached to POLK; BUNCOMBE not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 50/p. 38)

BUNCOMBE (now LYON) attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

BUNCOMBE renamed LYON. (Iowa Acts 1862, ext. sess., ch. 23, sec. 1/p. 22)

LYON fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 575)

Legislature authorized creation of MADISON (proposed) from LEE, dependent on local referendum that failed; county was never created. (History of Lee, 448; Iowa Terr. Laws 1843-1844, ch. 124, secs. 1, 9/pp. 142-144; Roberts and Moorhead, 1:55-59)

MADISON created by Iowa Territory from Non-County Area 3 attached to MAHASKA; MADISON not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, sec. 10/p. 75)

MADISON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MADISON fully organized. (Swisher, "Organization of Counties," 575)

MAHASKA created by Iowa Territory from KEOKUK and Non-County Area 3 attached to WASHINGTON; MAHASKA not fully organized, attached to WASHINGTON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 6/pp. 132-133)

MAHASKA fully organized, detached from WASHINGTON; Non-County Area 3 detached from WASHINGTON, attached to MAHASKA "for election, revenue, and judicial purposes"; POWESHIEK and Non-County Area 8 detached from IOWA, attached to MAHASKA "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

MAHASKA lost part of attached Non-County Area 3 to creation of MARION. (Iowa Terr. Laws 1845, ch. 57, sec. 1/pp. 93-96)

MAHASKA lost part of attached Non-County Area 3 to creation of MADISON and WARREN; lost part of attached Non-County Area 8 to creation of DALLAS, JASPER, and POLK. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 3-4, 6, 9-10/pp. 74-75)

MAHASKA lost part of attached Non-County Area 8 to DALLAS. (Iowa Terr. Laws 1845-1846, ch. 83, secs. 1-3/pp. 75-76)

Non-County Area 8 detached from MAHASKA, became part of Non-County Area 9 attached to POLK "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

MAHASKA became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MAHASKA lost most of attached Non-County Area 3 to creation of POTTAWATTAMIE. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

POWESHIEK fully organized, detached from MAHASKA. (Iowa Acts 1848, ext. sess., ch. 54, sec. 1/pp. 55-57)

MAHASKA lost all of attached Non-County Area 3 to POTTAWATTAMIE and to creation of ADAIR; Non-County Area 3 eliminated. (Iowa Acts 1850-1851, ch. 9, sec. 2/p. 27)

MARION created by Iowa Territory from Non-County Area 3 attached to MAHASKA. (Iowa Terr. Laws 1845, ch. 57, sec. 1/pp. 93-96)

MARION became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MARION's boundaries redefined [no change]. (Iowa Acts 1846-1847, ch. 15, secs. 1, 3/p. 36)

MARSHALL created by Iowa Territory from Non-County Area 7 attached to LINN; MARSHALL not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74)

MARSHALL attached to JASPER "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

MARSHALL became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MARSHALL fully organized, detached from JASPER. (Swisher, "Organization of Counties," 574-575)

HARDIN attached to MARSHALL for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

HARDIN fully organized, detached from MARSHALL. (Swisher, "Organization of Counties," 575)

Michigan Territory gained unorganized federal territory west of the Mississippi River, north of the state of Missouri, and east of the Missouri and White Earth Rivers, including all of present Iowa. (Terr. Papers U.S. 12: 778-779; U.S. Stat. Vol. 4, ch. 98 [1834]/p. 701)

MILLS created from POTTAWATTAMIE; MILLS not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 6/p. 28)

MILLS fully organized. (Swisher, "Organization of Counties," 575)

ST. CHARLES (Mo.) lost all territory in present Iowa. All of Iowa became non-county area in Missouri Territory. (Mo. Terr. Laws 1813-1814, ch. 99, sec. 1/pp. 293-295)

ST. CHARLES (Mo.) gained non-county area in Missouri Territory that was ceded by the Osage Indians on 10 November 1808; ST. CHARLES (Mo.) again included part of present Iowa. (Terr. Papers U.S., 15:40-41)

Non-county area of Missouri Territory was expanded to include all of present Iowa when HOWARD (Mo.) and PIKE (Mo.) were eliminated from present Iowa. (Mo. Laws Pub. And Gen., 1: ch 265, 267/pp.650-652, 655-661)

MITCHELL created from Non-County Area 6 attached to DELAWARE; MITCHELL not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 43/p. 37)

MITCHELL attached to CHICKASAW for administrative and judicial purposes (MITCHELL indirectly attached to FAYETTE, through CHICKASAW, until 12 September 1853).) (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

MITCHELL fully organized, detached from CHICKASAW. (Iowa Acts 1854-1855, ch. 113, sec. 1/p. 176; Swisher, "Organization of Counties," 575)

MITCHELL gained from FLOYD. (Iowa Acts 1854-1855, ch. 120, secs. 1-2/pp. 185-186)

MITCHELL attached to FLOYD "for judicial purposes," although no evidence has been found that the attachment was effected [not mapped]. (Clyde and Dwelle, 1:17; History of Mitchell and Worth, 145, 148; Iowa Acts 1854-1855, ch. 111, secs. 5-6/pp. 174-175; Swisher, "Organization of Counties," 545-546)

WORTH detached from FLOYD, attached to MITCHELL "for judicial purposes." (Iowa Acts 1856-1857, ch. 56, secs. 2, 4/pp. 66-67)

WORTH detached from MITCHELL, attached to CERRO GORDO "for judicial, election, and revenue purposes." (Iowa Acts 1858, ch. 47, secs. 1, 3/p. 53)

MONONA created from Non-County Area 9 attached to POLK; MONONA not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 25/p. 33)

MONONA attached to HARRISON "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 12/p. 23)

MONONA fully organized, detached from HARRISON. (Swisher, "Organization of Counties," 575)

Circa 10 October 1865, MONONA lost to CRAWFORD. (Crawford County Supervisors records, Book 1:309; Garver, "Establishment of Counties," 430)

KISHKEKOSH (now MONROE) created by Iowa Territory from Non-County Area 4 attached to HENRY; KISHKEKOSH not fully organized, attached to JEFFERSON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 4/p. 132)

KISHKEKOSH (now MONROE) detached from JEFFERSON, attached to WAPELLO "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 100, secs. 1, 16/pp. 114-117)

KISHKEKOSH (now MONROE) fully organized, detached from WAPELLO; Non-County Area 4 detached from WAPPELLO, attached to KISHKEKOSH "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845, ch. 67, secs. 1, 16/pp. 103-106)

KISHKEKOSH (now MONROE) lost part of attached Non-County Area 4 to creation of CLARKE and LUCAS. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 2, 11/pp. 73-75)

KISHKEKOSH renamed MONROE. (Iowa Terr. Laws 1845-1846, ch. 118, secs. 1-2/p. 108)

MONROE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

MONROE lost most of attached Non-County Area 4 to creation of POTTAWATTAMIE. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

Non-County Area 4 attached to MONROE gained from CLARKE. (Iowa Acts 1848-1849, ch. 9, secs. 1-2/pp. 332-333)

MONROE lost all of attached Non-County Area 4 to creation of UNION; Non-County Area 4 eliminated. (Iowa Acts 1850-1851, ch. 9, sec. 1/p. 27)

MONTGOMERY created from POTTAWATTAMIE; MONTGOMERY not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 5/p. 28)

MONTGOMERY attached to ADAMS "for election, revenue, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 11/p. 23)

MONTGOMERY fully organized, detached from ADAMS. (Swisher, "Organization of Counties," 575)

MUSCATINE created by Wisconsin Territory from DES MOINES; COOK (extinct) attached to MUSCATINE "for all judicial purposes." (Wis. Terr. Laws 1836, no. 21, sec. 6/pp. 77-78)

MUSCATINE lost to creation of JOHNSON and SCOTT. (Wis. Terr. Laws 1837, no. 6, secs. 14, 16, 17-19/pp. 135-137)

MUSCATINE gained all of COOK and Non-County Area 2, lost to LOUISA and lost to creation of SLAUGHTER (now WASHINGTON); COOK and Non-County Area 2 eliminated. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

MUSCATINE became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

MUSCATINE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Part of present Iowa became Non-County Area 1 in Wisconsin Territory when DES MOINES lost to creation of six new counties. (Wis. Terr. Laws 1836, no. 21, pp. 76-78)

Non-County Area 1 in Wisconsin Territory lost to the creation of JOHNSON and KEOKUK. (Wis. Terr. Laws 1837, no. 6, secs. 14-16/pp. 135-136)

Non-County Area 1 lost to the creation of Non-County Areas 3, 4, and 5 by Wisconsin Territory; Non-County Area 1 eliminated. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 2 created by Wisconsin Territory from DUBUQUE. (Wis. Terr. Laws 1837, no. 6; pp. 135-136)

Non-County Area 2 lost all territory to MUSCATINE; Non-County Area 2 eliminated. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 3 created by Wisconsin Territory from Non-County Area 1; Non-County Area 3 attached to SLAUGHTER (now WASHINGTON) "for judicial purposes." (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 3 lost to WASHINGTON. (Iowa Terr. Laws 1838-1839, pp. 100-101)

Non-County Area 3 exchanged with KEOKUK, lost to creation of MAHASKA. (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6, 8-11/pp. 132-134)

Non-County Area 3 detached from WASHINGTON, attached to MAHASKA "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

Non-County Area 3 attached to MAHASKA lost to creation of MARION. (Iowa Terr. Laws 1845, ch. 57, sec. 1/pp. 93-96)

Non-County Area 3 attached to MAHASKA lost to creation of MADISON and WARREN. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 3-4, 6, 9-10/pp. 74-75)

Non-County Area 3 attached to MAHASKA lost to creation of POTTAWATTAMIE; Non-County Area 3 was divided into two parts by this creation. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

Non-County Area 3 attached to MAHASKA lost all territory to POTTAWATTAMIE and to creation of ADAIR; Non-County Area 3 eliminated. (Iowa Acts 1850-1851, ch. 9, sec. 2/p. 27)

Non-County Area 4 created by Wisconsin Territory from HENRY and Non-County Area 1; Non-County Area 4 attached to HENRY "for judicial purposes." (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 4 lost to creation of JEFFERSON. (Iowa Terr. Laws 1838-1839, pp. 92-94)

Non-County Area 4 lost to JEFFERSON, and lost to creation of KISHKEKOSH (now MONROE) and WAPELLO. Non-County Area 4 detached from HENRY, attached to JEFFERSON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 3-4/p. 132)

Non-County Area 4 detached from JEFFERSON, attached to WAPELLO "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 100, secs. 1, 16/pp. 114-117)

Non-County Area 4 detached from WAPPELLO, attached to KISHKEKOSH (now MONROE) "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845, ch. 67, secs. 1, 16/pp. 103-106)

Non-County Area 4 attached to KISHKEKOSH (now MONROE) lost to creation of CLARKE and LUCAS. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 2, 11/pp. 73-75)

Non-County Area 4 attached to MONROE lost to creation of POTTAWATTAMIE. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

Non-County Area 4 attached to MONROE gained from CLARKE. (Iowa Acts 1848-1849, ch. 9, secs. 1-2/pp. 332-333)

Non-County Area 4 attached to MONROE lost all territory to creation of UNION; Non-County Area 4 eliminated. (Iowa Acts 1850-1851, ch. 9, sec. 1/p. 27)

Non-County Area 5 created by Wisconsin Territory from Non-County Area 1 and VAN BUREN. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 5 attached to VAN BUREN "for judicial purposes." (Wis. Terr. Laws 1838, spec. sess., no. 7, sec. 5/p. 541)

Missouri expanded its claim to part of present Iowa by claiming a strip of land (approximately 10 miles wide) north of the present boundary, between the Des Moines and Missouri Rivers; the encroachment overlapped VAN BUREN and Non-County Area 5 attached to VAN BUREN [not mapped]. Iowa continued in control of the disputed area. (Mo. Laws 1838, p. 14)

Non-County Area 5 lost to creation of APPANOOSE and DAVIS. (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 1-2/pp. 131-132)

Non-County Area 5 detached from VAN BUREN, attached to DAVIS "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 122, secs. 1, 11, 13/pp. 137-139)

Non-County Area 5 attached to DAVIS lost to creation of DECATUR and WAYNE. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 1, 12/pp. 73-75

Non-County Area 5 detached from DAVIS, attached to APPANOOSE "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 60, secs. 1, 15/pp. 55-58)

Non-County Area 5 attached to APPANOOSE lost all territory to creation of FREMONT, PAGE, RINGGOLD, and TAYLOR; Non-County Area 5 eliminated. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Non-County Area 6 created by Iowa Territory from BUCHANAN and FAYETTE; included parts of present Iowa, Minnesota, and North and South Dakota. Non-County Area 6 attached to DELAWARE "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 11/p. 134)

Non-County Area 6 gained part of Non-County Area 7, lost to creation of Non-County Area 9. Non-County Area 6 included territory in present Iowa and Minnesota and remained attached to DELAWARE. (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

Non-County Area 6 attached to DELAWARE lost to unorganized federal territory when the state of Iowa was created from Iowa Territory; Non-County Area 6 eliminated from present Minnesota. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Non-County Area 6 attached to DELAWARE lost all territory to creation of BREMER, BUTLER, CERRO GORDO, CHICKASAW, FLOYD, FRANKLIN, GRUNDY, HARDIN, HOWARD, MITCHELL, and WORTH; Non-County Area 6 eliminated. (Iowa Acts 1850-1851, ch. 9, secs. 8-12/pp. 29-30, secs. 33-35/p.35, secs. 43-44/p. 37)

Non-County Area 7 created by Iowa Territory from BENTON; Non-County Area 7 attached to LINN "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6, 8-11/pp. 132-134)

Non-County Area 7 attached to LINN lost to creation of BOONE, MARSHALL, and STORY. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74)

Non-County Area 7 lost all territory to Non-County Area 6 and to the creation of Non-County Area 9; Non-County Area 7 eliminated. (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

Non-County Area 8 created by Iowa Territory from KEOKUK; Non-County Area 8 attached to IOWA "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6, 8-11/pp. 132-134)

Non-County Area 8 detached from IOWA, attached to MAHASKA "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

Non-County Area 8 attached to MAHASKA lost to creation of DALLAS, POLK, and JASPER. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 3-4, 6, 9-10/pp. 74-75)

Non-County Area 8 attached to MAHASKA lost to DALLAS. (Iowa Terr. Laws 1845-1846, ch. 83, secs. 1-3/pp. 75-76)

Non-County Area 8 lost all territory to creation of Non-County Area 9; Non-County Area 8 eliminated. (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

Non-County Area 9 created from all of Non-County Area 8 and part of Non-County Areas 6 and 7; included parts of present Iowa, Minnesota, and North and South Dakota. Non-County Area 9 attached to POLK "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

Non-County Area 9 attached to POLK lost to unorganized federal territory when the state of Iowa was created from Iowa Territory; Non-County Area 9 eliminated from present Minnesota, North Dakota, and South Dakota. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Non-County Area 9 attached to POLK lost to creation of POTTAWATTAMIE. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

Non-County Area 9 lost to creation of Non-County Area 11; Non-County Area 11 detached from POLK, attached to DALLAS "for election, revenue, and judicial purposes." (Iowa Acts 1846-1847, ch. 50, secs. 1, 10, 17/pp. 61-62)

Non-County Area 9 attached to POLK lost all territory to creation of BANCROFT (extinct), BUENA VISTA, BUNCOMBE (now LYON), CARROLL, CERRO GORDO, CHEROKEE, CLAY, CRAWFORD, DICKINSON, EMMET, FOX (now CALHOUN), FRANKLIN, GREENE, HANCOCK, HARDIN, HUMBOLDT, IDA, KOSSUTH, MONONA, O'BRIEN, OSCEOLA, PALO ALTO, PLYMOUTH, POCAHONTAS, RISLEY (extinct), SAC, SIOUX, WAHKAW (now WOODBURY), WINNEGAGO, WORTH, WRIGHT, and YELL (extinct); Non-County Area 9 eliminated. (Iowa Acts 1850-1851, ch. 9, secs. 11-50/pp. 29-38)

Non-County Area 10 created from CLAYTON and FAYETTE. (Iowa Acts 1846-1847, ch. 23, secs. 1-2/pp. 39-40)

Non-County Area 10 lost all territory to creation of ALLAMAKEE and WINNESHIEK; Non-County Area 10 eliminated. (Iowa Acts 1846-1847, ch. 66, secs. 1-2/p. 75)

Non-County Area 11 created from part of Non-County Area 9; Non-County Area 11 detached from POLK, attached to DALLAS "for election, revenue, and judicial purposes." Non-County Area 11 was in two parts. (Iowa Acts 1846-1847, ch. 50, secs. 1, 10, 17/pp. 61-62)

Non-County Area 11 attached to DALLAS lost all territory to creation of AUDUBON, GUTHRIE, HARRISON, and SHELBY; Non-County Area 11 eliminated. (Iowa Acts 1850-1851, ch. 9, secs. 17-18, 23-24/pp. 31-33)

O'BRIEN created from Non-County Area 9 attached to POLK; O'BRIEN not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 40/p. 36)

O'BRIEN attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

O'BRIEN fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 575)

O'BRIEN attached to CLAY "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

O'BRIEN detached from CLAY, attached to CHEROKEE "for judicial purposes". (Iowa Acts 1868, ch. 73, secs. 2, 8/pp. 99-100)

O'BRIEN fully organized, detached from CHEROKEE when judicial attachments of 7 April 1868 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

OSCEOLA created from Non-County Area 9 attached to POLK; OSCEOLA not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 49/p. 38)

OSCEOLA attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

OSCEOLA fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 576)

PAGE created from Non-County Area 5 attached to APPANOOSE; PAGE not fully organized, not attached. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Missouri implicitly overlapped PAGE when it claimed, before the U.S. Supreme Court, a state boundary approximately 10 miles north of the present boundary [not mapped] (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of PAGE ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

PAGE fully organized. (Swisher, "Organization of Counties," 576)

PALO ALTO created from Non-County Area 9 attached to POLK; PALO ALTO not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 38/p. 36)

PALO ALTO attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

PALO ALTO detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

PALO ALTO fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 576)

PIKE (Mo.) created by Missouri Territory from ST. CHARLES (Mo.); PIKE included part of present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 231/pp. 585-588)

PIKE (Mo.) lost to non-county area and to creation of CHARITON (Mo.) and RALLS (Mo.); PIKE (Mo.) eliminated from present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 265/pp. 650-652, and ch. 267/pp. 655-661)

PLYMOUTH created from Non-County Area 9 attached to POLK; PLYMOUTH not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 32/p. 35)

PLYMOUTH attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

PLYMOUTH fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 576)

PLYMOUTH reattached to WOODBURY "for judicial purposes." (Iowa Acts 1868, ch. 73, secs. 2, 8/pp. 99-100)

PLYMOUTH fully organized, detached from WOODBURY when judicial attachments of 7 April 1868 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

POCAHONTAS created from Non-County Area 9 attached to POLK; POCAHONTAS not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 29/p. 34)

POCAHONTAS attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

POCAHONTAS detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

POCAHONTAS fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 576)

POLK created by Iowa Territory from Non-County Area 8 attached to MAHASKA; POLK not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, sec. 4/p. 74)

POLK gained from DALLAS, lost to JASPER. (Iowa Terr. Laws 1845-1846, ch. 83, secs. 1-3/pp. 75-76)

POLK fully organized; Non-County Area 9 attached to POLK "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95)

POLK lost part of attached Non-County Area 9 to unorganized federal territory when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

POLK gained from WARREN [attachments unchanged]. (Iowa Acts 1846-1847, ch. 17, sec. 1/pp. 36-37)

POLK lost part of attached Non-County Area 9 to creation of POTTAWATTAMIE. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

POLK lost part of attached Non-County Area 9 to creation of Non-County Area 11; Non-County Area 11 detached from POLK, attached to DALLAS "for election, revenue, and judicial purposes." (Iowa Acts 1846-1847, ch. 50, secs. 1, 10, 17/pp. 61-62)

BOONE fully organized, detached from POLK. (Swisher, "Organization of Counties," 574-575)

POLK lost all of attached Non-County Area 9 to creation of BANCROFT (extinct), BUENA VISTA, BUNCOMBE (now LYON), CARROLL, CERRO GORDO, CHEROKEE, CLAY, CRAWFORD, DICKINSON, EMMET, FOX (now CALHOUN), FRANKLIN, GREENE, HANCOCK, HARDIN, HUMBOLDT, IDA, KOSSUTH, MONONA, O'BRIEN, OSCEOLA, PALO ALTO, PLYMOUTH, POCAHONTAS, RISLEY (extinct), SAC, SIOUX, WAHKAW (now WOODBURY), WINNEGAGO, WORTH, WRIGHT, and YELL (extinct); Non-County Area 9 eliminated. (Iowa Acts 1850-1851, ch. 9, secs. 11-50/pp. 29-38)

STORY detached from POLK, attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

POLK lost to WARREN. (Iowa Acts 1852-1853, ch. 18, secs. 1-2/pp. 40-41)

STORY authorized to gain the parts of the town of Sheldahl located in BOONE and POLK, dependent upon local referendum that failed [no change]. (Garver, "Establishment of Counties," 434; Iowa Acts 1880, ch. 197, secs. 1-3/pp. 191-192)

POTTAWATTAMIE created from Non-County Area 3 attached to MAHASKA, Non-County Area 4 attached to MONROE, and Non-County Area 9 attached to POLK; POTTAWATTAMIE not fully organized, not attached. (Iowa Acts 1846-1847, ch. 84, sec. 1/pp. 100-101; Swisher, "Organization of Counties," 519-520)

POTTAWATTAMIE fully organized. (Swisher, "Organization of Counties," 576)

POTTAWATTAMIE lost to creation of ADAIR, ADAMS, AUDUBON, CARROLL, CASS, CRAWFORD, HARRISON, MILLS, MONTGOMERY, SHELBY, and UNION, and, at its northwest corner, gained remnant of Non-County Area 3 that had been attached to MAHASKA. (Iowa Acts 1850-1851, ch. 9, secs. 1-6, 18, 22-24/pp. 27-28, 31-33)

Legislature authorized creation of BELKNAP (proposed) from POTTAWATTAMIE, dependent on local referendum that failed; BELKNAP was never created. (Garver, "Establishment of Counties," 433; Iowa Acts 1874, priv., ch. 23, secs. 1-4/pp. 19-21)

Legislature authorized creation of GRIMES (proposed) from POTTAWATTAMIE, dependent on local referendum that failed. GRIMES was never created; it had boundaries identical to BELKNAP (proposed), which failed to win approval in 1874. (Garver, "Establishment of Counties," 433-434; Iowa Acts 1876, ch. 160, secs. 1-4/pp. 156-159)

POWESHIEK created by Iowa Territory from KEOKUK; POWESHIEK not fully organized, attached to IOWA "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 8/p. 133)

POWESHIEK and Non-County Area 8 indirectly attached to JOHNSON, through IOWA, until 1 March 1844. (Iowa Terr. Laws 1843-1844, ch. 4, secs. 1-2/p. 3)

POWESHIEK detached from IOWA, attached to MAHASKA "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

POWESHIEK became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

POWESHIEK fully organized, detached from MAHASKA. (Iowa Acts 1848, ext. sess., ch. 54, sec. 1/pp. 55-57)

RINGGOLD created from Non-County Area 5 attached to APPANOOSE; RINGGOLD not fully organized, not attached. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Missouri implicitly overlapped RINGGOLD when it claimed, before the U.S. Supreme Court, a state boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of RINGGOLD ended when the U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

RINGGOLD attached to TAYLOR "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 19/p. 19)

RINGGOLD fully organized, detached from TAYLOR. (Iowa Acts 1854-1855, ch. 37, secs. 1, 8/pp. 50-51; Iowa Acts 1856-1857, ch. 16, secs. 1-2/pp. 13-14)

RISLEY (extinct) created from Non-County Area 9 attached to POLK; RISLEY not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 14/p. 30)

RISLEY lost all territory to creation of WEBSTER; RISLEY eliminated. (Iowa Acts 1852-1853, ch. 52, sec. 1/pp. 87-88)

SAC created from Non-County Area 9 attached to POLK; SAC not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 21/p. 32)

SAC attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

SAC detached from WOODBURY, attached to GREENE "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

SAC fully organized, detached from GREENE. (Swisher, "Organization of Counties," 576)

IDA attached to SAC "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

IDA fully organized, detached from SAC when judicial attachments of 30 March 1864 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

ST. CHARLES District (Mo.) created as one of five districts by the District of Louisiana (renamed Louisiana Territory in 1805); ST. CHARLES District (Mo.), included all of present Iowa. (Terr. Papers U.S., 13:51-52; U.S. Stat., vol. 2, ch. 38[1804]/pp. 283-289)

ST. CHARLES District (Mo.) became a county in Missouri Territory when Louisiana Territory was renamed Missouri Territory. (Terr. Papers U.S., 14:599-601; U.S. Stat., vol. 2, ch. 95 [1812]/pp. 743-747)

ST. CHARLES (Mo.) gained non-county area in Missouri Territory that was ceded by the Osage Indians on 10 November 1808; ST. CHARLES (Mo.) again included part of present Iowa. (Terr. Papers U.S., 15:40-41)

ST. CHARLES (Mo.) lost to creation of HOWARD (Mo.); ST. CHARLES (Mo.) included part of present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 162/pp. 460-464)

As a Missouri Territory county, ST. CHARLES (Mo.) lost to creation of both LINCOLN (Mo.) and MONTGOMERY (Mo.) in present Missouri; ST. CHARLES was divided into two parts by this creation. ST. CHARLES's area within present Iowa was unchanged. (Mo. Laws Pub. and Gen., 1:ch. 228, 230/pp. 572-576, 580-584)

ST. CHARLES (Mo.) lost to creation of PIKE (Mo.); ST. CHARLES (Mo.) eliminated from present Iowa. (Mo. Laws Pub. and Gen., 1:ch. 231/pp. 585-588)

SCOTT created by Wisconsin Territory from COOK (extinct), DUBUQUE, and MUSCATINE; CLINTON attached to SCOTT "until otherwise directed by law." (Wis. Terr. Laws 1837, no. 6, secs. 17-19/pp. 136-137)

SCOTT became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

CLINTON fully organized, detached from SCOTT. (Iowa Terr. Laws 1839-1840, ch. 39, sec. 1/pp. 67-68)

SCOTT became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

SHELBY created from POTTAWATTAMIE and Non-County Area 11 attached to DALLAS; SHELBY not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 23/pp. 32-33)

SHELBY fully organized; CARROLL and CRAWFORD attached to SHELBY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, secs. 8, 13/p. 23)

CARROLL detached from SHELBY, attached to GUTHRIE "for judicial, election, and revenue purposes." (Iowa Acts 1854-1855, ch. 8, secs. 1-2/pp. 6-7)

CRAWFORD fully organized, detached from SHELBY. (Swisher, "Organization of Counties," 574)

SIOUX created from Non-County Area 9 attached to POLK; SIOUX not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 41/p. 36)

SIOUX attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24)

SIOUX fully organized, detached from WOODBURY. (Swisher, "Organization of Counties," 576)

SIOUX reattached to WOODBURY "for judicial purposes." (Iowa Acts 1864, ch. 47, secs. 2, 9/pp. 47-49)

SIOUX fully organized, detached from WOODBURY when judicial attachments of 30 March 1864 were repealed. (Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4)

STORY created by Iowa Territory from Non-County Area 7 attached to LINN; STORY not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74)

STORY attached to POLK "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 101, sec. 12/pp. 93-94)

STORY became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

STORY detached from POLK, attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

STORY fully organized, detached from BOONE. (Swisher, "Organization of Counties," 576)

STORY authorized to gain the parts of the town of Sheldahl located in BOONE and POLK, dependent upon local referendum that failed [no change]. (Garver, "Establishment of Counties," 434; Iowa Acts 1880, ch. 197, secs. 1-3/pp. 191-192)

TAMA created by Iowa Territory from BENTON; TAMA not fully organized, attached to LINN "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 10/pp. 133-134)

TAMA detached from LINN, attached to BENTON "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88)

TAMA became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

TAMA fully organized, detached from BENTON. (Swisher, "Organization of Counties," 576)

Boundary between TAMA and BENTON confirmed [no change]. (Iowa Acts 1858, ch. 123, sec. 1/pp. 240-241)

TAYLOR created from Non-County Area 5 attached to APPANOOSE; TAYLOR not fully organized, not attached. (Iowa Acts 1846-1847, ch. 83, secs. 1-4/p. 100)

Missouri implicitly overlapped TAYLOR when it claimed, before the U.S. Supreme Court, a boundary with Iowa 10 miles north of the present boundary [not mapped]. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of TAYLOR ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

TAYLOR fully organized. (Swisher, "Organization of Counties," 576)

RINGGOLD attached to TAYLOR "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, sec. 19/p. 19)

RINGGOLD fully organized, detached from TAYLOR. (Iowa Acts 1854-1855, ch. 37, secs. 1, 8/pp. 50-51; Iowa Acts 1856-1857, ch. 16, secs. 1-2/pp. 13-14)

UNION created from POTTAWATTAMIE and Non-County Area 4 attached to MONROE; UNION not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 1/p. 27)

UNION fully organized. (Iowa Acts 1852-1853, ch. 11, sec. 1/pp. 26-27)

The state of Missouri was created from Missouri Territory; the remainder of Missouri Territory, including all of present Iowa, became unorganized federal territory. (Terr. Papers U.S., 15:742-744; U.S. Stat., vol. 3, ch. 22 [1820]/pp. 545-548; Van Zandt, 117)

VAN BUREN created by Wisconsin Territory from DES MOINES. (Wis. Terr. Laws 1836, no. 21, sec. 2/pp. 76-78)

VAN BUREN gained from HENRY, exchanged with Non-County Area 5. (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

Non-County Area 5 attached to VAN BUREN "for judicial purposes." (Wis. Terr. Laws 1838, spec. sess., no. 7, sec. 5/p. 541)

VAN BUREN became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

VAN BUREN overlapped by CLARK (Mo.) when Missouri legislature expanded CLARK into area claimed by Iowa Territory, creating a dispute finally settled in Iowa's favor by U.S. Supreme Court in 1849. (Mo. Laws 1838, p. 22)

Missouri expanded its claim to part of present Iowa by claiming a strip of land (approximately 10 miles wide) north of the present boundary, between the Des Moines and Missouri Rivers; the encroachment overlapped VAN BUREN and Non-County Area 5 attached to VAN BUREN [not mapped]. Iowa continued in control of the disputed area. (Mo. Laws 1838, p. 14)

VAN BUREN lost part of attached Non-County Area 5 to creation of APPANOOSE and DAVIS; APPANOOSE and DAVIS attached to VAN BUREN "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 1-2/pp. 131-132)

DAVIS fully organized, detached from VAN BUREN; APPANOOSE and Non-County Area 5 detached from VAN BUREN, attached to DAVIS "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 122, secs. 1, 11, 13/pp. 137-139)

VAN BUREN became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Missouri defended its overlap of present Iowa (including VAN BUREN) in arguments before U.S. Supreme Court. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap of VAN BUREN ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

WAPELLO created by Iowa Territory from Non-County Area 4 attached to HENRY; WAPELLO not fully organized, attached to JEFFERSON "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 3-4/p. 132)

WAPELLO fully organized, detached from JEFFERSON; KISHKEKOSH (now MONROE) and Non-County Area 4 detached from JEFFERSON, attached to WAPELLO "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1843-1844, ch. 100, secs. 1, 16/pp. 114-117)

KISHKEKOSH (now MONROE) fully organized, detached from WAPELLO; Non-County Area 4 detached from WAPPELLO, attached to KISHKEKOSH "for election, revenue, and judicial purposes." (Iowa Terr. Laws 1845, ch. 67, secs. 1, 16/pp. 103-106)

WAPELLO became became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

WARREN created by Iowa Territory from Non-County Area 3 attached to MAHASKA; WARREN not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, sec. 3/p. 74)

WARREN became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

WARREN lost to POLK. (Iowa Acts 1846-1847, ch. 17, sec. 1/pp. 36-37)

WARREN fully organized. (Swisher, "Organization of Counties," 576)

WARREN gained from POLK. (Iowa Acts 1852-1853, ch. 18, secs. 1-2/pp. 40-41)

SLAUGHTER (now WASHINGTON) created by Wisconsin Territory from HENRY, LOUISA, MUSCATINE, and Non-County Area 1; Non-County Area 3 attached to SLAUGHTER "for judicial purposes." (Wis. Terr. Laws 1837, no. 67, secs. 1-7/pp. 381-384)

SLAUGHTER (now WASHINGTON) became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. (U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241)

SLAUGHTER (now WASHINGTON) lost to LOUISA [attachment unchanged]. (Iowa Terr. Laws 1838-1839, pp. 89-91)

SLAUGHTER renamed WASHINGTON; WASHINGTON gained from JOHNSON, KEOKUK, and Non-County Area 3 attached to SLAUGHTER. (Iowa Terr. Laws 1838-1839, pp. 100-101)

KEOKUK detached from JOHNSON, attached to WASHINGTON; MAHASKA attached to WASHINGTON. All attachments were "for judicial, revenue, and election purposes." (Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-6/pp. 132-133)

KEOKUK and MAHASKA fully organized, detached from WASHINGTON; Non-County Area 3 detached from WASHINGTON, attached to MAHASKA "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89)

WASHINGTON lost to JOHNSON. (Iowa Terr. Laws 1845, ch. 45, sec. 1/pp. 66-67)

WASHINGTON became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

WAYNE created by Iowa Territory from Non-County Area 5 attached to DAVIS; WAYNE not fully organized, not attached. (Iowa Terr. Laws 1845-1846, ch. 82, secs. 1, 12/pp. 73-75)

WAYNE attached to APPANOOSE "for election, revenue, and judicial purposes". (Iowa Terr. Laws 1845-1846, ch. 60, secs. 1, 15/pp. 55-58)

WAYNE became an Iowa county when the state of Iowa was created from Iowa Territory. (U.S. Stat., vol. 9, ch. 1[1847]/p. 117)

Missouri implicitly overlapped WAYNE when it claimed, before U.S. Supreme Court, a state boundary with Iowa 10 miles north of the present boundary. (Landers, 647; Thomas, 268-269)

Missouri's implicit overlap WAYNE ended when U.S. Supreme Court set the Iowa-Missouri boundary at its present location [no change]. (Landers, 647-648; Thomas, 269-270)

WAYNE fully organized, detached from APPANOOSE. (Swisher, "Organization of Counties," 576)

WEBSTER created from RISLEY and YELL; RISLEY and YELL eliminated. WEBSTER not fully organized, attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 52, sec. 1/pp. 87-88)

WEBSTER fully organized, detached from BOONE. (Swisher, "Organization of Counties," 576)

WEBSTER gained southern half of HUMBOLDT; HUMBOLDT eliminated. EMMET, HANCOCK, KOSSUTH, PALO ALTO, POCAHONTAS, WINNEBAGO, and WRIGHT detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts 1854-1855, ch. 141-142, secs. 1-2/pp. 210-211)

WRIGHT fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 551, 576)

KOSSUTH fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

WEBSTER lost to creation of HAMILTON; EMMET, HANCOCK, PALO ALTO, POCAHONTAS, and WINNEBAGO remained attached to WEBSTER. (Iowa Acts 1856-1857, ch. 15, secs. 1, 9/pp. 11-13)

WEBSTER lost to re-creation of HUMBOLDT [attachments unchanged]. (Iowa Acts 1856-1857, ch. 147, secs. 1, 10/pp. 199-200)

WINNEBAGO fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 559-560, 576)

WEBSTER lost to HUMBOLDT. (Iowa Acts 1858, ch. 42, secs. 1-2/pp. 49-50)

HANCOCK fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

PALO ALTO fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 576)

EMMET fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 575)

POCAHONTAS fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 576)

WEBSTER gained from HUMBOLDT when the state supreme court ruled the boundary change of 11 March 1858 unconstitutional. (Garver, "Establishment of Counties," 428-430; Iowa Reports, 12:1-14)

WINNEBAGO created from Non-County Area 9 attached to POLK; WINNEBAGO not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 45/p. 37)

WINNEBAGO attached to BOONE for administrative and judicial purposes. (Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28)

WINNEBAGO detached from BOONE, attached to WEBSTER "for election, judicial, and revenue purposes." (Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211)

WINNEBAGO fully organized, detached from WEBSTER. (Swisher, "Organization of Counties," 559-560, 576)

WINNESHIEK created from Non-County Area 10; Non-County-Area 10 eliminated. WINNESHIEK not fully organized, not attached. (Iowa Acts 1846-1847, ch. 66, secs. 1-2/p. 75)

WINNESHIEK fully organized. (Iowa Acts 1850-1851, ch. 11, sec. 1/pp. 39-41)

WAHKAW (now WOODBURY) created from Non-County Area 9 attached to POLK; WAHKAW not fully organized, not attached. (Iowa Acts 1850-1851, ch. 9, sec. 27/pp. 33-34)

WAHKAW renamed WOODBURY. (Iowa Acts 1852-1853, ch. 12, sec. 4/p. 28)

WOODBURY fully organized; BUENA VISTA, BUNCOMBE (now LYON), CHEROKEE, CLAY, DICKINSON, IDA, O'BRIEN, OSCEOLA, PLYMOUTH, SAC, and SIOUX attached to WOODBURY "for revenue, election, and judicial purposes". (Iowa Acts 1852-1853, ch. 8, secs. 8, 14/pp. 23-24)