RANKING · 2010 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 2010

Washington counties with the youngest median age (2010 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 40.2.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

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