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List of Washington Counties and County Seats





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The U.S. state of Washington is divided into 39 counties. Explore list of California Counties and their County Seats in alphabetical order populations, areas and the date of formation.

List of Washington Counties and County Seat

S.NCountyCounty SeatPopulation(2011)Area Formed
1Adams CountyRitzville18,7281,925 sq mi1883
2Asotin CountyAsotin21,623636 sq mi1883
3Benton CountyProsser175,1771,703 sq mi1905
4Chelan CountyWenatchee72,4532,922 sq mi1899
5Clallam CountyPort Angeles71,4041,745 sq mi1854
6Clark CountyVancouver425,363628 sq mi1845
7Columbia CountyDayton4,078869 sq mi1875
8Cowlitz CountyKelso102,4101,139 sq mi1854
9Douglas CountyWaterville38,4311,821 sq mi1883
10Ferry CountyRepublic7,5512,204 sq mi1899
11Franklin CountyPasco78,1631,242 sq mi1883
12Garfield CountyPomeroy2,266710 sq mi1881
13Grant CountyEphrata89,1202,681 sq mi1909
14Grays Harbor CountyMontesano72,7971,917 sq mi1854
15Island CountyCoupeville78,506209 sq mi1853
16Jefferson CountyPort Townsend29,8721,809 sq mi1852
17King CountySeattle1,931,2492,126 sq mi1852
18Kitsap CountyPort Orchard251,133396 sq mi1857
19Kittitas CountyEllensburg40,9152,297 sq mi1883
20Klickitat CountyGoldendale20,3181,872 sq mi1859
21Lewis CountyChehalis75,4552,408 sq mi1845
22Lincoln CountyDavenport10,5702,311 sq mi1883
23Mason CountyShelton60,699961 sq mi1854
24Okanogan CountyOkanogan41,1205,268 sq mi1888
25Pacific CountySouth Bend20,920975 sq mi1851
26Pend Oreille CountyNewport13,0011,400 sq mi1911
27Pierce CountyTacoma795,2251,676 sq mi1852
28San Juan CountyFriday Harbor15,769175 sq mi1873
29Skagit CountyMount Vernon116,9011,735 sq mi1883
30Skamania CountyStevenson11,0661,656 sq mi1854
31Snohomish CountyEverett713,3352,090 sq mi1861
32Spokane CountySpokane471,2211,764 sq mi1879
33Stevens CountyColville43,5312,478 sq mi1863
34Thurston CountyOlympia252,264727 sq mi1852
35Wahkiakum CountyCathlamet3,978264 sq mi1854
36Walla Walla CountyWalla Walla58,7811,270 sq mi1854
37Whatcom CountyBellingham201,1402,120 sq mi1854
38Whitman CountyColfax44,7762,159 sq mi1871
39Yakima CountyYakima243,2314,296 sq mi1865