RANKING · 2000 CENSUS · 39 SHOWN OF 39

Largest by population, Washington counties · 2000

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.

WashingtonAll states All rankings

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, WAWA2,344,9391,737,034+0%

02Pierce County, WAWA946,288700,820+0%

03Snohomish County, WAWA870,656606,024+0%

04Spokane County, WAWA558,344417,939+0%

05Clark County, WAWA532,119345,238+0%

06Kitsap County, WAWA283,374231,969+0%

07Yakima County, WAWA259,185222,581+0%

08Thurston County, WAWA304,261207,355+0%

09Whatcom County, WAWA236,392166,814+0%

10Benton County, WAWA221,722142,475+0%

11Skagit County, WAWA132,975102,979+0%

12Cowlitz County, WAWA114,88592,948+0%

13Grant County, WAWA105,72774,698+0%

14Island County, WAWA85,65771,558+0%

15Lewis County, WAWA88,06268,600+0%

16Grays Harbor County, WAWA78,14467,194+0%

17Chelan County, WAWA81,94166,616+0%

18Clallam County, WAWA78,20264,525+0%

19Walla Walla County, WAWA62,36155,180+0%

20Mason County, WAWA71,16549,405+0%

21Franklin County, WAWA102,61249,347+0%

22Whitman County, WAWA48,51240,740+0%

23Stevens County, WAWA49,66840,066+0%

24Okanogan County, WAWA45,23039,564+0%

25Kittitas County, WAWA48,80333,362+0%

26Douglas County, WAWA46,47332,603+0%

27Jefferson County, WAWA33,97025,953+0%

28Pacific County, WAWA24,35720,984+0%

29Asotin County, WAWA22,54520,551+0%

30Klickitat County, WAWA24,33119,161+0%

31Adams County, WAWA21,48816,428+0%

32San Juan County, WAWA18,57714,077+0%

33Pend Oreille County, WAWA14,45711,732+0%

34Lincoln County, WAWA11,98210,184+0%

35Skamania County, WAWA12,6699,872+0%

36Ferry County, WAWA7,5177,260+0%

37Columbia County, WAWA4,1414,064+0%

38Wahkiakum County, WAWA4,8733,824+0%

39Garfield County, WAWA2,4162,397+0%

SHOWING 1–39 OF 39

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