RANKING · 2020 CENSUS · 39 SHOWN OF 39

Fastest growing, Washington counties · 2020

Washington counties ranked by population growth from the 2010 census to 2020. 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 population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Franklin County, WAWA102,612+23.8%−25%

02Clark County, WAWA532,119+18.3%−59%

03Benton County, WAWA221,722+18.1%−32%

04King County, WAWA2,344,939+17.5%+15%

05Thurston County, WAWA304,261+16.9%−41%

06Snohomish County, WAWA870,656+16.1%−47%

07Pierce County, WAWA946,288+15.8%−19%

08Spokane County, WAWA558,344+14.5%−8%

09San Juan County, WAWA18,577+12.8%−68%

10Whatcom County, WAWA236,392+12.8%−58%

11Klickitat County, WAWA24,331+11.9%−22%

12Douglas County, WAWA46,473+11.7%−52%

13Pacific County, WAWA24,357+11.7%+5%

14Grant County, WAWA105,727+11.2%−69%

15Wahkiakum County, WAWA4,873+11.2%−25%

16Skagit County, WAWA132,975+10.8%−63%

17Island County, WAWA85,657+10.6%−44%

18Jefferson County, WAWA33,970+10.4%−64%

19Adams County, WAWA21,488+10.1%−52%

20Kitsap County, WAWA283,374+9.7%−56%

21Chelan County, WAWA81,941+9.1%−67%

22Lewis County, WAWA88,062+8.9%−43%

23Skamania County, WAWA12,669+8.8%−54%

24Kittitas County, WAWA48,803+8.4%−66%

25Mason County, WAWA71,165+8.3%−71%

26Cowlitz County, WAWA114,885+8.1%−38%

27Clallam County, WAWA78,202+8.1%−44%

28Whitman County, WAWA48,512+7.1%+41%

29Stevens County, WAWA49,668+6.7%−77%

30Walla Walla County, WAWA62,361+6.5%−54%

31Yakima County, WAWA259,185+5.5%−69%

32Grays Harbor County, WAWA78,144+3.9%−17%

33Pend Oreille County, WAWA14,457+3.1%−90%

34Asotin County, WAWA22,545+3.1%−82%

35Lincoln County, WAWA11,982+2.9%−81%

36Okanogan County, WAWA45,230+2.4%−87%

37Garfield County, WAWA2,416+0.9%−87%

38Columbia County, WAWA4,141-3.1%−411%

39Ferry County, WAWA7,517-4.9%−132%

SHOWING 1–39 OF 39

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS