RANKING · 2020 CENSUS · 39 SHOWN OF 39

Most population lost, Washington counties · 2020

Washington counties that lost the most residents from the 2010 census to 2020, 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 gained, US counties →

WashingtonAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Ferry County, WAWA7,517-373−139%

02Columbia County, WAWA4,141-126−415%

03Garfield County, WAWA2,416+20−87%

04Lincoln County, WAWA11,982+306−77%

05Pend Oreille County, WAWA14,457+400−86%

06Wahkiakum County, WAWA4,873+444−11%

07Asotin County, WAWA22,545+662−78%

08Skamania County, WAWA12,669+970−39%

09Okanogan County, WAWA45,230+984−84%

10Adams County, WAWA21,488+1,885−33%

11San Juan County, WAWA18,577+2,019−50%

12Klickitat County, WAWA24,331+2,417−5%

13Pacific County, WAWA24,357+2,445+16%

14Grays Harbor County, WAWA78,144+2,839−6%

15Stevens County, WAWA49,668+2,914−68%

16Jefferson County, WAWA33,970+3,105−47%

17Whitman County, WAWA48,512+3,197+63%

18Kittitas County, WAWA48,803+3,422−48%

19Walla Walla County, WAWA62,361+3,803−44%

20Douglas County, WAWA46,473+4,507−30%

21Mason County, WAWA71,165+5,027−55%

22Clallam County, WAWA78,202+5,751−29%

23Chelan County, WAWA81,941+6,621−54%

24Lewis County, WAWA88,062+6,694−28%

25Cowlitz County, WAWA114,885+8,320−23%

26Island County, WAWA85,657+8,351−27%

27Grant County, WAWA105,727+10,003−50%

28Skagit County, WAWA132,975+12,622−46%

29Yakima County, WAWA259,185+13,497−60%

30Franklin County, WAWA102,612+18,586+57%

31Kitsap County, WAWA283,374+24,478−42%

32Whatcom County, WAWA236,392+25,707−34%

33Benton County, WAWA221,722+31,696+6%

34Thurston County, WAWA304,261+42,529−8%

35Spokane County, WAWA558,344+68,118+20%

36Clark County, WAWA532,119+77,948−27%

37Snohomish County, WAWA870,656+114,622−18%

38Pierce County, WAWA946,288+125,905+10%

39King County, WAWA2,344,939+338,426+47%

SHOWING 1–39 OF 39

Download CSV (full list, 39 rows)

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