RANKING · 2025 ESTIMATES · 39 SHOWN OF 39

Most sparsely populated, Washington counties

Washington counties with the fewest residents per square mile (2025). This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Garfield County, WAWA2,4163–

02Ferry County, WAWA7,5173–

03Columbia County, WAWA4,1415–

04Lincoln County, WAWA11,9825–

05Skamania County, WAWA12,6698–

06Okanogan County, WAWA45,2309–

07Pend Oreille County, WAWA14,45710–

08Adams County, WAWA21,48811–

09Klickitat County, WAWA24,33113–

10Wahkiakum County, WAWA4,87319–

11Jefferson County, WAWA33,97019–

12Stevens County, WAWA49,66820–

13Kittitas County, WAWA48,80321–

14Whitman County, WAWA48,51222–

15Douglas County, WAWA46,47326–

16Pacific County, WAWA24,35726–

17Chelan County, WAWA81,94128–

18Asotin County, WAWA22,54535–

19Lewis County, WAWA88,06237–

20Grant County, WAWA105,72739–

21Grays Harbor County, WAWA78,14441–

22Clallam County, WAWA78,20245–

23Walla Walla County, WAWA62,36149–

24Yakima County, WAWA259,18560–

25Mason County, WAWA71,16574–

26Skagit County, WAWA132,97577–

27Franklin County, WAWA102,61283–

28Cowlitz County, WAWA114,885101–

29San Juan County, WAWA18,577107–

30Whatcom County, WAWA236,392112–

31Benton County, WAWA221,722130–

32Spokane County, WAWA558,344316–

33Island County, WAWA85,657411–

34Snohomish County, WAWA870,656417–

35Thurston County, WAWA304,261421–

36Pierce County, WAWA946,288567–

37Kitsap County, WAWA283,374717–

38Clark County, WAWA532,119847–

39King County, WAWA2,344,9391,108–

SHOWING 1–39 OF 39

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