Idaho Atlas of Historical County Boundaries
John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Emily Kelley, Historical Compiler; Laura Rico-Beck, GIS Specialist and Digital Compiler; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant
Copyright The Newberry Library 2007
ALTA (extinct)
ALTURAS (extinct)
Annexation 1 (proposed)
Annexation 2 (proposed)
Annexation 3 (proposed)
Annexation 4 (proposed)
Annexation 5 (proposed)
Annexation 6 (proposed)
BEAVERHEAD (Mont.)
BIG HORN (Mont., orig.) (now CUSTER, Mont.)
CHAMPOEG (Ore.) (now MARION, Ore.)
CHOTEAU (Mont.) (now CHOUTEAU, Mont.)
CLACKAMAS (Ore.)
DAWSON (Mont.)
DEER LODGE (Mont.)
LAH-TOH (Idaho Terr., extinct)
LANE (Ore.)
LINN (Ore.)
LOGAN (extinct)
MARION (Ore.) (created as CHAMPOEG, Ore.)
MISSOULA (Mont.)
OGALALA (Idaho Terr., extinct)
Oregon Territory (non-county area)
SELWAY (proposed)
SKAMANIA (Wash.)
SPOKANE (Wash. Terr.; orig., extinct)
WALLA WALLA (Wash.)
WASCO (Ore.)
Washington Territory (non-county area)
YELLOWSTONE (Idaho Terr., extinct)