RANKING · 2024 ACS · 39 SHOWN OF 39

Youngest by median age, Washington counties

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, WAWA48,51226.4+7%

02Adams County, WAWA21,48829.3−1%

03Franklin County, WAWA102,61230.9+10%

04Yakima County, WAWA259,18533.3+7%

05Grant County, WAWA105,72733.7+8%

06Kittitas County, WAWA48,80335.8+14%

07Benton County, WAWA221,72236.3+6%

08Pierce County, WAWA946,28837.0+9%

09King County, WAWA2,344,93937.4+5%

10Whatcom County, WAWA236,39238.4+13%

11Walla Walla County, WAWA62,36138.5+10%

12Spokane County, WAWA558,34438.5+9%

13Snohomish County, WAWA870,65638.6+11%

14Douglas County, WAWA46,47338.9+9%

15Clark County, WAWA532,11939.1+14%

16Thurston County, WAWA304,26140.0+10%

17Kitsap County, WAWA283,37440.2+12%

18Chelan County, WAWA81,94140.4+11%

19Cowlitz County, WAWA114,88541.5+12%

20Skagit County, WAWA132,97542.1+13%

21Lewis County, WAWA88,06242.2+10%

22Okanogan County, WAWA45,23043.2+13%

23Grays Harbor County, WAWA78,14444.7+15%

24Mason County, WAWA71,16544.7+11%

25Island County, WAWA85,65744.8+21%

26Asotin County, WAWA22,54546.2+19%

27Klickitat County, WAWA24,33146.8+18%

28Lincoln County, WAWA11,98246.9+10%

29Stevens County, WAWA49,66846.9+20%

30Garfield County, WAWA2,41647.8+11%

31Skamania County, WAWA12,66948.5+25%

32Columbia County, WAWA4,14149.6+17%

33Pend Oreille County, WAWA14,45749.8+19%

34Clallam County, WAWA78,20252.1+19%

35Ferry County, WAWA7,51752.9+32%

36Wahkiakum County, WAWA4,87354.5+23%

37Pacific County, WAWA24,35755.0+20%

38San Juan County, WAWA18,57757.0+20%

39Jefferson County, WAWA33,97059.8+27%

SHOWING 1–39 OF 39

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