Washington 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
BOISE (Idaho)
CHEHALIS (now GRAYS HARBOR)
CLACKAMAS (Ore.)
Disputed Area (San Juan Islands)
FERGUSON (extinct)
GRAYS HARBOR (created as CHEHALIS)
IDAHO (Idaho)
MISSOULA (Mont.)
NEZ PERCE (Idaho)
Oregon Country (non-county area)
QUILLEHUYTE (extinct)
SAWAMISH (now MASON)
SHOSHONE (Idaho)
SLAUGHTER (now KITSAP)
TUALITY (Ore.) (now WASHINGTON, Ore.)
VANCOUVER (see CLARK)