RANKING · 2010 CENSUS · 39 SHOWN OF 39

Largest by population, Washington counties · 2010

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, WAWA2,344,9391,931,249+11%

02Pierce County, WAWA946,288795,225+13%

03Snohomish County, WAWA870,656713,335+18%

04Spokane County, WAWA558,344471,221+13%

05Clark County, WAWA532,119425,363+23%

06Thurston County, WAWA304,261252,264+22%

07Kitsap County, WAWA283,374251,133+8%

08Yakima County, WAWA259,185243,231+9%

09Whatcom County, WAWA236,392201,140+21%

10Benton County, WAWA221,722175,177+23%

11Skagit County, WAWA132,975116,901+14%

12Cowlitz County, WAWA114,885102,410+10%

13Grant County, WAWA105,72789,120+19%

14Island County, WAWA85,65778,506+10%

15Franklin County, WAWA102,61278,163+58%

16Lewis County, WAWA88,06275,455+10%

17Grays Harbor County, WAWA78,14472,797+8%

18Chelan County, WAWA81,94172,453+9%

19Clallam County, WAWA78,20271,404+11%

20Mason County, WAWA71,16560,699+23%

21Walla Walla County, WAWA62,36158,781+7%

22Whitman County, WAWA48,51244,776+10%

23Stevens County, WAWA49,66843,531+9%

24Okanogan County, WAWA45,23041,120+4%

25Kittitas County, WAWA48,80340,915+23%

26Douglas County, WAWA46,47338,431+18%

27Jefferson County, WAWA33,97029,872+15%

28Asotin County, WAWA22,54521,623+5%

29Pacific County, WAWA24,35720,920−0%

30Klickitat County, WAWA24,33120,318+6%

31Adams County, WAWA21,48818,728+14%

32San Juan County, WAWA18,57715,769+12%

33Pend Oreille County, WAWA14,45713,001+11%

34Skamania County, WAWA12,66911,066+12%

35Lincoln County, WAWA11,98210,570+4%

36Ferry County, WAWA7,5177,551+4%

37Columbia County, WAWA4,1414,078+0%

38Wahkiakum County, WAWA4,8733,978+4%

39Garfield County, WAWA2,4162,266−5%

SHOWING 1–39 OF 39

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