RANKING · 2010 CENSUS · 39 SHOWN OF 39

Fastest growing, Washington counties · 2010

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

01Franklin County, WAWA102,612+58.4%+84%

02Clark County, WAWA532,119+23.2%−48%

03Benton County, WAWA221,722+23.0%−14%

04Mason County, WAWA71,165+22.9%−21%

05Kittitas County, WAWA48,803+22.6%−9%

06Thurston County, WAWA304,261+21.7%−24%

07Whatcom County, WAWA236,392+20.6%−33%

08Grant County, WAWA105,727+19.3%−47%

09Douglas County, WAWA46,473+17.9%−27%

10Snohomish County, WAWA870,656+17.7%−41%

11Jefferson County, WAWA33,970+15.1%−48%

12Adams County, WAWA21,488+14.0%−33%

13Skagit County, WAWA132,975+13.5%−54%

14Pierce County, WAWA946,288+13.5%−31%

15Spokane County, WAWA558,344+12.7%−19%

16Skamania County, WAWA12,669+12.1%−37%

17San Juan County, WAWA18,577+12.0%−70%

18King County, WAWA2,344,939+11.2%−27%

19Pend Oreille County, WAWA14,457+10.8%−66%

20Clallam County, WAWA78,202+10.7%−25%

21Cowlitz County, WAWA114,885+10.2%−23%

22Lewis County, WAWA88,062+10.0%−36%

23Whitman County, WAWA48,512+9.9%+95%

24Island County, WAWA85,657+9.7%−49%

25Yakima County, WAWA259,185+9.3%−48%

26Chelan County, WAWA81,941+8.8%−68%

27Stevens County, WAWA49,668+8.6%−71%

28Grays Harbor County, WAWA78,144+8.3%+77%

29Kitsap County, WAWA283,374+8.3%−63%

30Walla Walla County, WAWA62,361+6.5%−53%

31Klickitat County, WAWA24,331+6.0%−61%

32Asotin County, WAWA22,545+5.2%−69%

33Wahkiakum County, WAWA4,873+4.0%−73%

34Ferry County, WAWA7,517+4.0%−74%

35Okanogan County, WAWA45,230+3.9%−79%

36Lincoln County, WAWA11,982+3.8%−75%

37Columbia County, WAWA4,141+0.3%−65%

38Pacific County, WAWA24,357-0.3%−103%

39Garfield County, WAWA2,416-5.5%−182%

SHOWING 1–39 OF 39

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