Washington

Pend Oreille County Stevens County Ferry County Whatcom County Okanogan County Whatcom County Whatcom County San Juan County San Juan County San Juan County Skagit County Skagit County Skagit County Skagit County Chelan County Clallam County Island County Snohomish County Island County Douglas County Jefferson County Spokane County Snohomish County Grant County Lincoln County Kitsap County King County Mason County Kittitas County Grays Harbor County King County Pierce County Whitman County Adams County Thurston County Yakima County Pacific County Lewis County Franklin County Garfield County Benton County Columbia County Walla Walla County Asotin County Wahkiakum County Cowlitz County Skamania County Clark County Klickitat County Klickitat County

COUNTY 2015 POPULATION SQUARE MILES COUNTY SEAT BOARD SIZE FOUNDED
Adams County 19,254 1,930 Ritzville  1883 
Asotin County 22,105 641 Asotin  1883 
Benton County 190,309 1,760 Prosser  1905 
Chelan County 75,644 2,994 Wenatchee  1899 
Clallam County 73,486 2,671 Port Angeles  1854 
Clark County 459,495 656 Vancouver  1845 
Columbia County 3,944 873 Dayton  1875 
Cowlitz County 103,468 1,166 Kelso  1854 
Douglas County 40,534 1,849 Waterville  1883 
Ferry County 7,582 2,257 Republic  1899 
Franklin County 88,807 1,265 Pasco  1883 
Garfield County 2,219 718 Pomeroy  1881 
Grant County 93,259 2,791 Ephrata  1909 
Grays Harbor County 71,122 2,224 Montesano  1855 
Island County 80,593 517 Coupeville  1854 
Jefferson County 30,466 2,183 Port Townsend  1854 
King County 2,117,125 2,307 Seattle  1852 
Kitsap County 260,131 566 Port Orchard  1857 
Kittitas County 43,269 2,333 Ellensburg  1883 
Klickitat County 21,026 1,904 Goldendale  1859 
Lewis County 75,882 2,436 Chehalis  1845 
Lincoln County 10,321 2,339 Davenport  1883 
Mason County 61,023 1,051 Shelton  1854 
Okanogan County 41,516 5,315 Okanogan  1888 
Pacific County 20,848 1,223 South Bend  1854 
Pend Oreille County 13,088 1,425 Newport  1911 
Pierce County 843,954 1,806 Tacoma  1853 
San Juan County 16,252 621 Friday Harbor  1873 
Skagit County 121,846 1,920 Mount Vernon  1883 
Skamania County 11,339 1,684 Stevenson  1854 
Snohomish County 772,501 2,196 Everett  1861 
Spokane County 490,945 1,781 Spokane  1858 
Stevens County 43,791 2,541 Colville  1854 
Thurston County 269,536 774 Olympia  1852 
Wahkiakum County 4,042 287 Cathlamet  1854 
Walla Walla County 60,338 1,299 Walla Walla  1854 
Whatcom County 212,284 2,503 Bellingham  1854 
Whitman County 48,177 2,178 Colfax  1871 
Yakima County 248,830 4,311 Yakima  1865 

* consolidated city-county government