RANKING · 2000 CENSUS · 39 SHOWN OF 39

Fastest growing, Washington counties · 2000

Washington counties ranked by population growth since the prior decennial census. This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Clark County, WAWA532,119+45.0%+0%

02San Juan County, WAWA18,577+40.3%+0%

03Grant County, WAWA105,727+36.4%+0%

04Franklin County, WAWA102,612+31.7%+0%

05Pend Oreille County, WAWA14,457+31.6%+0%

06Whatcom County, WAWA236,392+30.5%+0%

07Snohomish County, WAWA870,656+30.1%+0%

08Stevens County, WAWA49,668+29.5%+0%

09Skagit County, WAWA132,975+29.4%+0%

10Mason County, WAWA71,165+28.9%+0%

11Jefferson County, WAWA33,970+28.8%+0%

12Thurston County, WAWA304,261+28.6%+0%

13Chelan County, WAWA81,941+27.5%+0%

14Benton County, WAWA221,722+26.6%+0%

15Kittitas County, WAWA48,803+24.8%+0%

16Douglas County, WAWA46,473+24.4%+0%

17Kitsap County, WAWA283,374+22.3%+0%

18Adams County, WAWA21,488+20.8%+0%

19Pierce County, WAWA946,288+19.6%+0%

20Skamania County, WAWA12,669+19.1%+0%

21Island County, WAWA85,657+18.9%+0%

22Okanogan County, WAWA45,230+18.6%+0%

23Yakima County, WAWA259,185+17.9%+0%

24Asotin County, WAWA22,545+16.7%+0%

25Spokane County, WAWA558,344+15.7%+0%

26Lewis County, WAWA88,062+15.6%+0%

27Ferry County, WAWA7,517+15.3%+0%

28Klickitat County, WAWA24,331+15.3%+0%

29King County, WAWA2,344,939+15.2%+0%

30Wahkiakum County, WAWA4,873+14.9%+0%

31Lincoln County, WAWA11,982+14.9%+0%

32Clallam County, WAWA78,202+14.3%+0%

33Walla Walla County, WAWA62,361+13.9%+0%

34Cowlitz County, WAWA114,885+13.2%+0%

35Pacific County, WAWA24,357+11.1%+0%

36Garfield County, WAWA2,416+6.6%+0%

37Whitman County, WAWA48,512+5.1%+0%

38Grays Harbor County, WAWA78,144+4.7%+0%

39Columbia County, WAWA4,141+1.0%+0%

SHOWING 1–39 OF 39

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