RANKING · 1990 CENSUS · 39 SHOWN OF 39

Most sparsely populated, Washington counties · 1990

Washington counties with the fewest residents per square mile (1990). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 28.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS –

01Ferry County, WAWA7,5173–

02Garfield County, WAWA2,4163–

03Lincoln County, WAWA11,9824–

04Columbia County, WAWA4,1415–

05Skamania County, WAWA12,6695–

06Okanogan County, WAWA45,2306–

07Pend Oreille County, WAWA14,4576–

08Adams County, WAWA21,4887–

09Klickitat County, WAWA24,3319–

10Jefferson County, WAWA33,97011–

11Kittitas County, WAWA48,80312–

12Stevens County, WAWA49,66812–

13Wahkiakum County, WAWA4,87313–

14Douglas County, WAWA46,47314–

15Chelan County, WAWA81,94118–

16Whitman County, WAWA48,51218–

17Pacific County, WAWA24,35720–

18Grant County, WAWA105,72720–

19Lewis County, WAWA88,06225–

20Asotin County, WAWA22,54528–

21Franklin County, WAWA102,61230–

22Clallam County, WAWA78,20232–

23Grays Harbor County, WAWA78,14434–

24Walla Walla County, WAWA62,36138–

25Mason County, WAWA71,16540–

26Yakima County, WAWA259,18544–

27Skagit County, WAWA132,97546–

28San Juan County, WAWA18,57758–

29Whatcom County, WAWA236,39261–

30Benton County, WAWA221,72266–

31Cowlitz County, WAWA114,88572–

32Spokane County, WAWA558,344205–

33Thurston County, WAWA304,261223–

34Snohomish County, WAWA870,656223–

35Island County, WAWA85,657289–

36Pierce County, WAWA946,288351–

37Clark County, WAWA532,119379–

38Kitsap County, WAWA283,374480–

39King County, WAWA2,344,939712–

SHOWING 1–39 OF 39

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