RANKING · 1990 CENSUS · 39 SHOWN OF 39

Largest by population, Washington counties · 1990

The most populous us counties as of the 2023 estimates. This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPTOTAL POPULATIONVS 2000

01King County, WAWA2,344,9391,507,319−13%

02Pierce County, WAWA946,288586,203−16%

03Snohomish County, WAWA870,656465,642−23%

04Spokane County, WAWA558,344361,364−14%

05Clark County, WAWA532,119238,053−31%

06Kitsap County, WAWA283,374189,731−18%

07Yakima County, WAWA259,185188,823−15%

08Thurston County, WAWA304,261161,238−22%

09Whatcom County, WAWA236,392127,780−23%

10Benton County, WAWA221,722112,560−21%

11Cowlitz County, WAWA114,88582,119−12%

12Skagit County, WAWA132,97579,555−23%

13Grays Harbor County, WAWA78,14464,175−4%

14Island County, WAWA85,65760,195−16%

15Lewis County, WAWA88,06259,358−13%

16Clallam County, WAWA78,20256,464−12%

17Grant County, WAWA105,72754,758−27%

18Chelan County, WAWA81,94152,250−22%

19Walla Walla County, WAWA62,36148,439−12%

20Whitman County, WAWA48,51238,775−5%

21Mason County, WAWA71,16538,341−22%

22Franklin County, WAWA102,61237,473−24%

23Okanogan County, WAWA45,23033,350−16%

24Stevens County, WAWA49,66830,948−23%

25Kittitas County, WAWA48,80326,725−20%

26Douglas County, WAWA46,47326,205−20%

27Jefferson County, WAWA33,97020,146−22%

28Pacific County, WAWA24,35718,882−10%

29Asotin County, WAWA22,54517,605−14%

30Klickitat County, WAWA24,33116,616−13%

31Adams County, WAWA21,48813,603−17%

32San Juan County, WAWA18,57710,035−29%

33Pend Oreille County, WAWA14,4578,915−24%

34Lincoln County, WAWA11,9828,864−13%

35Skamania County, WAWA12,6698,289−16%

36Ferry County, WAWA7,5176,295−13%

37Columbia County, WAWA4,1414,024−1%

38Wahkiakum County, WAWA4,8733,327−13%

39Garfield County, WAWA2,4162,248−6%

SHOWING 1–39 OF 39

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES