RANKING · 2025 ESTIMATES · 39 SHOWN OF 39

Fastest growing, Washington counties

Washington counties ranked by population growth from the 2020 census to 2025. 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

01Wahkiakum County, WAWA4,873+10.2%−32%

02Lincoln County, WAWA11,982+10.2%−32%

03Kittitas County, WAWA48,803+10.1%−59%

04Mason County, WAWA71,165+8.3%−71%

05Douglas County, WAWA46,473+8.2%−66%

06Pend Oreille County, WAWA14,457+7.9%−75%

07Okanogan County, WAWA45,230+7.4%−60%

08Lewis County, WAWA88,062+7.2%−54%

09Benton County, WAWA221,722+7.2%−73%

10Klickitat County, WAWA24,331+7.0%−54%

11Stevens County, WAWA49,668+6.9%−76%

12Grant County, WAWA105,727+6.7%−82%

13Franklin County, WAWA102,612+6.1%−81%

14Clark County, WAWA532,119+5.7%−87%

15Garfield County, WAWA2,416+5.7%−14%

16Skamania County, WAWA12,669+5.3%−72%

17Snohomish County, WAWA870,656+5.2%−83%

18Columbia County, WAWA4,141+4.8%+381%

19Ferry County, WAWA7,517+4.7%−69%

20San Juan County, WAWA18,577+4.4%−89%

21Pacific County, WAWA24,357+4.2%−62%

22Adams County, WAWA21,488+4.2%−80%

23Whatcom County, WAWA236,392+4.2%−86%

24Cowlitz County, WAWA114,885+3.8%−72%

25Chelan County, WAWA81,941+3.6%−87%

26Spokane County, WAWA558,344+3.5%−77%

27King County, WAWA2,344,939+3.3%−78%

28Grays Harbor County, WAWA78,144+3.3%−30%

29Thurston County, WAWA304,261+3.2%−89%

30Jefferson County, WAWA33,970+3.0%−90%

31Kitsap County, WAWA283,374+2.8%−87%

32Pierce County, WAWA946,288+2.7%−86%

33Skagit County, WAWA132,975+2.7%−91%

34Clallam County, WAWA78,202+1.4%−90%

35Asotin County, WAWA22,545+1.2%−93%

36Whitman County, WAWA48,512+1.1%−78%

37Yakima County, WAWA259,185+1.0%−95%

38Walla Walla County, WAWA62,361-0.4%−103%

39Island County, WAWA85,657-1.4%−107%

SHOWING 1–39 OF 39

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES