RANKING · 2010 CENSUS · 39 SHOWN OF 39

Most sparsely populated, Washington counties · 2010

Washington counties with the fewest residents per square mile (2023). This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most densely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Garfield County, WAWA2,4163−5%

02Ferry County, WAWA7,5173+4%

03Lincoln County, WAWA11,9825+4%

04Columbia County, WAWA4,1415+0%

05Skamania County, WAWA12,6697+12%

06Okanogan County, WAWA45,2308+4%

07Pend Oreille County, WAWA14,4579+11%

08Adams County, WAWA21,48810+14%

09Klickitat County, WAWA24,33111+6%

10Wahkiakum County, WAWA4,87315+4%

11Jefferson County, WAWA33,97017+15%

12Stevens County, WAWA49,66818+9%

13Kittitas County, WAWA48,80318+23%

14Whitman County, WAWA48,51221+10%

15Douglas County, WAWA46,47321+18%

16Pacific County, WAWA24,35722−0%

17Chelan County, WAWA81,94125+9%

18Lewis County, WAWA88,06231+10%

19Grant County, WAWA105,72733+19%

20Asotin County, WAWA22,54534+5%

21Grays Harbor County, WAWA78,14438+8%

22Clallam County, WAWA78,20241+11%

23Walla Walla County, WAWA62,36146+7%

24Yakima County, WAWA259,18557+9%

25Franklin County, WAWA102,61263+58%

26Mason County, WAWA71,16563+23%

27Skagit County, WAWA132,97568+14%

28Cowlitz County, WAWA114,88590+10%

29San Juan County, WAWA18,57791+12%

30Whatcom County, WAWA236,39295+21%

31Benton County, WAWA221,722103+23%

32Spokane County, WAWA558,344267+13%

33Snohomish County, WAWA870,656342+18%

34Thurston County, WAWA304,261349+22%

35Island County, WAWA85,657377+10%

36Pierce County, WAWA946,288477+13%

37Kitsap County, WAWA283,374636+8%

38Clark County, WAWA532,119677+23%

39King County, WAWA2,344,939913+11%

SHOWING 1–39 OF 39

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES