RANKING · 2010 CENSUS · 39 SHOWN OF 39

Most population gained, Washington counties · 2010

Washington counties that added the most residents from the 2000 census to 2010, by raw count of people rather than percentage. This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

Flip the list · Most population lost, US counties →

WashingtonAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01King County, WAWA2,344,939+194,215−15%

02Snohomish County, WAWA870,656+107,311−24%

03Pierce County, WAWA946,288+94,405−18%

04Clark County, WAWA532,119+80,125−25%

05Spokane County, WAWA558,344+53,282−6%

06Thurston County, WAWA304,261+44,909−3%

07Whatcom County, WAWA236,392+34,326−12%

08Benton County, WAWA221,722+32,702+9%

09Franklin County, WAWA102,612+28,816+143%

10Yakima County, WAWA259,185+20,650−39%

11Kitsap County, WAWA283,374+19,164−55%

12Grant County, WAWA105,727+14,422−28%

13Skagit County, WAWA132,975+13,922−41%

14Mason County, WAWA71,165+11,294+2%

15Cowlitz County, WAWA114,885+9,462−13%

16Kittitas County, WAWA48,803+7,553+14%

17Island County, WAWA85,657+6,948−39%

18Clallam County, WAWA78,202+6,879−15%

19Lewis County, WAWA88,062+6,855−26%

20Chelan County, WAWA81,941+5,837−59%

21Douglas County, WAWA46,473+5,828−9%

22Grays Harbor County, WAWA78,144+5,603+86%

23Whitman County, WAWA48,512+4,036+105%

24Jefferson County, WAWA33,970+3,919−33%

25Walla Walla County, WAWA62,361+3,601−47%

26Stevens County, WAWA49,668+3,465−62%

27Adams County, WAWA21,488+2,300−19%

28San Juan County, WAWA18,577+1,692−58%

29Okanogan County, WAWA45,230+1,556−75%

30Pend Oreille County, WAWA14,457+1,269−55%

31Skamania County, WAWA12,669+1,194−25%

32Klickitat County, WAWA24,331+1,157−55%

33Asotin County, WAWA22,545+1,072−64%

34Lincoln County, WAWA11,982+386−71%

35Ferry County, WAWA7,517+291−70%

36Wahkiakum County, WAWA4,873+154−69%

37Columbia County, WAWA4,141+14−65%

38Pacific County, WAWA24,357-64−103%

39Garfield County, WAWA2,416-131−188%

SHOWING 1–39 OF 39

Download CSV (full list, 39 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS