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. The median across all 39 is +2,867. Biggest climber in the top 100 since 2020: Okanogan County, WA, up 12 places to #19.

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WashingtonAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

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

02▲1Snohomish County, WAWA870,656+42,699−70%

03▲1Clark County, WAWA532,119+28,808−73%

04▼2Pierce County, WAWA946,288+25,158−78%

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

06▲1Benton County, WAWA221,722+14,849−50%

07▲1Whatcom County, WAWA236,392+9,545−76%

08▼2Thurston County, WAWA304,261+9,468−79%

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

10▲3Grant County, WAWA105,727+6,604−67%

11▲5Lewis County, WAWA88,062+5,913−36%

12▼2Franklin County, WAWA102,612+5,863−51%

13▲6Mason County, WAWA71,165+5,439−51%

14▲8Kittitas County, WAWA48,803+4,466−33%

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

16▲4Douglas County, WAWA46,473+3,535−45%

17▼5Skagit County, WAWA132,975+3,452−85%

18▲7Stevens County, WAWA49,668+3,223−65%

19▲12Okanogan County, WAWA45,230+3,126−50%

20▼3Chelan County, WAWA81,941+2,867−80%

21▲5Grays Harbor County, WAWA78,144+2,508−17%

22▼11Yakima County, WAWA259,185+2,457−93%

23▲5Klickitat County, WAWA24,331+1,596−37%

24▲12Lincoln County, WAWA11,982+1,106−16%

25▲10Pend Oreille County, WAWA14,457+1,056−63%

26▼8Clallam County, WAWA78,202+1,047−87%

27▼3Jefferson County, WAWA33,970+993−83%

28▼1Pacific County, WAWA24,357+992−53%

29▲1Adams County, WAWA21,488+875−69%

30▼1San Juan County, WAWA18,577+789−80%

31▲1Skamania County, WAWA12,669+633−60%

32▼9Whitman County, WAWA48,512+539−73%

33▲1Wahkiakum County, WAWA4,873+451−9%

34▲5Ferry County, WAWA7,517+339−65%

35▼2Asotin County, WAWA22,545+260−91%

36▲2Columbia County, WAWA4,141+189+373%

37Garfield County, WAWA2,416+130−13%

38▼17Walla Walla County, WAWA62,361-223−103%

39▼25Island County, WAWA85,657-1,200−111%

SHOWING 1–39 OF 39

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES