RANKING · 2025 ESTIMATES · 39 SHOWN OF 39

Most population gained, Washington counties

Washington counties that added the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01King County, WAWA2,344,939+75,264−67%

02Snohomish County, WAWA870,656+42,699−70%

03Clark County, WAWA532,119+28,808−73%

04Pierce County, WAWA946,288+25,158−78%

05Spokane County, WAWA558,344+19,005−66%

06Benton County, WAWA221,722+14,849−50%

07Whatcom County, WAWA236,392+9,545−76%

08Thurston County, WAWA304,261+9,468−79%

09Kitsap County, WAWA283,374+7,763−82%

10Grant County, WAWA105,727+6,604−67%

11Lewis County, WAWA88,062+5,913−36%

12Franklin County, WAWA102,612+5,863−51%

13Mason County, WAWA71,165+5,439−51%

14Kittitas County, WAWA48,803+4,466−33%

15Cowlitz County, WAWA114,885+4,155−62%

16Douglas County, WAWA46,473+3,535−45%

17Skagit County, WAWA132,975+3,452−85%

18Stevens County, WAWA49,668+3,223−65%

19Okanogan County, WAWA45,230+3,126−50%

20Chelan County, WAWA81,941+2,867−80%

21Grays Harbor County, WAWA78,144+2,508−17%

22Yakima County, WAWA259,185+2,457−93%

23Klickitat County, WAWA24,331+1,596−37%

24Lincoln County, WAWA11,982+1,106−16%

25Pend Oreille County, WAWA14,457+1,056−63%

26Clallam County, WAWA78,202+1,047−87%

27Jefferson County, WAWA33,970+993−83%

28Pacific County, WAWA24,357+992−53%

29Adams County, WAWA21,488+875−69%

30San Juan County, WAWA18,577+789−80%

31Skamania County, WAWA12,669+633−60%

32Whitman County, WAWA48,512+539−73%

33Wahkiakum County, WAWA4,873+451−9%

34Ferry County, WAWA7,517+339−65%

35Asotin County, WAWA22,545+260−91%

36Columbia County, WAWA4,141+189+373%

37Garfield County, WAWA2,416+130−13%

38Walla Walla County, WAWA62,361-223−103%

39Island County, WAWA85,657-1,200−111%

SHOWING 1–39 OF 39

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