RANKING · 2010 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 2010

Washington counties with the youngest median age (2023 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Whitman County, WAWA48,51224.4−1%

02Franklin County, WAWA102,61228.4+1%

03Adams County, WAWA21,48829.0−2%

04Kittitas County, WAWA48,80331.9+2%

05Grant County, WAWA105,72732.1+3%

06Yakima County, WAWA259,18532.2+3%

07Benton County, WAWA221,72235.6+3%

08Pierce County, WAWA946,28835.9+5%

09Whatcom County, WAWA236,39236.6+8%

10Walla Walla County, WAWA62,36136.7+5%

11Clark County, WAWA532,11936.7+7%

12Douglas County, WAWA46,47336.8+3%

13Spokane County, WAWA558,34436.8+4%

14King County, WAWA2,344,93937.1+4%

15Snohomish County, WAWA870,65637.1+7%

16Thurston County, WAWA304,26138.5+5%

17Chelan County, WAWA81,94139.3+8%

18Kitsap County, WAWA283,37439.4+10%

19Skagit County, WAWA132,97540.1+8%

20Cowlitz County, WAWA114,88540.2+9%

21Lewis County, WAWA88,06241.5+8%

22Grays Harbor County, WAWA78,14441.9+8%

23Okanogan County, WAWA45,23042.9+12%

24Island County, WAWA85,65743.2+17%

25Asotin County, WAWA22,54543.5+12%

26Skamania County, WAWA12,66944.0+14%

27Mason County, WAWA71,16544.4+10%

28Stevens County, WAWA49,66845.0+15%

29Klickitat County, WAWA24,33145.3+15%

30Ferry County, WAWA7,51747.3+18%

31Lincoln County, WAWA11,98247.6+11%

32Pend Oreille County, WAWA14,45747.8+14%

33Columbia County, WAWA4,14148.3+14%

34Clallam County, WAWA78,20249.0+12%

35Garfield County, WAWA2,41649.0+14%

36Pacific County, WAWA24,35750.8+11%

37Wahkiakum County, WAWA4,87352.3+18%

38San Juan County, WAWA18,57752.7+11%

39Jefferson County, WAWA33,97053.9+14%

SHOWING 1–39 OF 39

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