RANKING · 2020 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 2020

Washington counties with the youngest median age (2020 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 42.2.

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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, WAWA48,51225.6+4%

02Adams County, WAWA21,48829.70%

03Franklin County, WAWA102,61230.9+10%

04Yakima County, WAWA259,18534.2+10%

05Grant County, WAWA105,72734.2+10%

06Benton County, WAWA221,72236.3+6%

07King County, WAWA2,344,93936.9+3%

08Pierce County, WAWA946,28836.9+8%

09Kittitas County, WAWA48,80337.2+18%

10Spokane County, WAWA558,34438.0+7%

11Whatcom County, WAWA236,39238.2+12%

12Snohomish County, WAWA870,65638.2+10%

13Douglas County, WAWA46,47338.4+8%

14Clark County, WAWA532,11938.8+13%

15Walla Walla County, WAWA62,36139.3+13%

16Thurston County, WAWA304,26139.5+8%

17Kitsap County, WAWA283,37439.8+11%

18Chelan County, WAWA81,94141.0+13%

19Cowlitz County, WAWA114,88541.0+11%

20Skagit County, WAWA132,97542.2+13%

21Lewis County, WAWA88,06242.6+11%

22Grays Harbor County, WAWA78,14444.8+15%

23Okanogan County, WAWA45,23044.8+17%

24Asotin County, WAWA22,54545.3+17%

25Island County, WAWA85,65745.8+24%

26Mason County, WAWA71,16545.8+14%

27Klickitat County, WAWA24,33146.0+16%

28Skamania County, WAWA12,66947.0+21%

29Garfield County, WAWA2,41648.1+12%

30Stevens County, WAWA49,66848.3+23%

31Lincoln County, WAWA11,98248.4+13%

32Ferry County, WAWA7,51751.6+29%

33Pend Oreille County, WAWA14,45751.6+23%

34Columbia County, WAWA4,14152.7+24%

35Clallam County, WAWA78,20252.9+21%

36Wahkiakum County, WAWA4,87353.4+20%

37Pacific County, WAWA24,35753.8+17%

38San Juan County, WAWA18,57756.1+18%

39Jefferson County, WAWA33,97059.6+27%

SHOWING 1–39 OF 39

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