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%−4.7 pts

02Lincoln County, WAWA11,982+10.2%−4.7 pts

03Kittitas County, WAWA48,803+10.1%−14.8 pts

04Mason County, WAWA71,165+8.3%−20.6 pts

05Douglas County, WAWA46,473+8.2%−16.2 pts

06Pend Oreille County, WAWA14,457+7.9%−23.7 pts

07Okanogan County, WAWA45,230+7.4%−11.2 pts

08Lewis County, WAWA88,062+7.2%−8.4 pts

09Benton County, WAWA221,722+7.2%−19.4 pts

10Klickitat County, WAWA24,331+7.0%−8.3 pts

11Stevens County, WAWA49,668+6.9%−22.5 pts

12Grant County, WAWA105,727+6.7%−29.8 pts

13Franklin County, WAWA102,612+6.1%−25.6 pts

14Clark County, WAWA532,119+5.7%−39.3 pts

15Garfield County, WAWA2,416+5.7%−0.9 pts

16Skamania County, WAWA12,669+5.3%−13.8 pts

17Snohomish County, WAWA870,656+5.2%−25.0 pts

18Columbia County, WAWA4,141+4.8%+3.8 pts

19Ferry County, WAWA7,517+4.7%−10.6 pts

20San Juan County, WAWA18,577+4.4%−35.8 pts

21Pacific County, WAWA24,357+4.2%−6.9 pts

22Adams County, WAWA21,488+4.2%−16.5 pts

23Whatcom County, WAWA236,392+4.2%−26.3 pts

24Cowlitz County, WAWA114,885+3.8%−9.4 pts

25Chelan County, WAWA81,941+3.6%−23.9 pts

26Spokane County, WAWA558,344+3.5%−12.1 pts

27King County, WAWA2,344,939+3.3%−11.9 pts

28Grays Harbor County, WAWA78,144+3.3%−1.4 pts

29Thurston County, WAWA304,261+3.2%−25.4 pts

30Jefferson County, WAWA33,970+3.0%−25.8 pts

31Kitsap County, WAWA283,374+2.8%−19.4 pts

32Pierce County, WAWA946,288+2.7%−16.8 pts

33Skagit County, WAWA132,975+2.7%−26.8 pts

34Clallam County, WAWA78,202+1.4%−12.9 pts

35Asotin County, WAWA22,545+1.2%−15.6 pts

36Whitman County, WAWA48,512+1.1%−3.9 pts

37Yakima County, WAWA259,185+1.0%−16.9 pts

38Walla Walla County, WAWA62,361-0.4%−14.3 pts

39Island County, WAWA85,657-1.4%−20.3 pts

SHOWING 1–39 OF 39

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES