RANKING · 2000 CENSUS · 39 SHOWN OF 39

Most population gained, Washington counties · 2000

Washington counties that added the most residents from the 1990 census to 2000, 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 +8,061.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01King County, WAWA2,344,939+229,715–

02Snohomish County, WAWA870,656+140,382–

03Pierce County, WAWA946,288+114,617–

04Clark County, WAWA532,119+107,185–

05Spokane County, WAWA558,344+56,575–

06Thurston County, WAWA304,261+46,117–

07Kitsap County, WAWA283,374+42,238–

08Whatcom County, WAWA236,392+39,034–

09Yakima County, WAWA259,185+33,758–

10Benton County, WAWA221,722+29,915–

11Skagit County, WAWA132,975+23,424–

12Grant County, WAWA105,727+19,940–

13Chelan County, WAWA81,941+14,366–

14Franklin County, WAWA102,612+11,874–

15Island County, WAWA85,657+11,363–

16Mason County, WAWA71,165+11,064–

17Cowlitz County, WAWA114,885+10,829–

18Lewis County, WAWA88,062+9,242–

19Stevens County, WAWA49,668+9,118–

20Clallam County, WAWA78,202+8,061–

21Walla Walla County, WAWA62,361+6,741–

22Kittitas County, WAWA48,803+6,637–

23Douglas County, WAWA46,473+6,398–

24Okanogan County, WAWA45,230+6,214–

25Jefferson County, WAWA33,970+5,807–

26San Juan County, WAWA18,577+4,042–

27Grays Harbor County, WAWA78,144+3,019–

28Asotin County, WAWA22,545+2,946–

29Adams County, WAWA21,488+2,825–

30Pend Oreille County, WAWA14,457+2,817–

31Klickitat County, WAWA24,331+2,545–

32Pacific County, WAWA24,357+2,102–

33Whitman County, WAWA48,512+1,965–

34Skamania County, WAWA12,669+1,583–

35Lincoln County, WAWA11,982+1,320–

36Ferry County, WAWA7,517+965–

37Wahkiakum County, WAWA4,873+497–

38Garfield County, WAWA2,416+149–

39Columbia County, WAWA4,141+40–

SHOWING 1–39 OF 39

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS