RANKING · 1990 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 1990

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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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, WAWA102,61228.9+3%

03Kittitas County, WAWA48,80330.3−3%

04Adams County, WAWA21,48830.9+4%

05Pierce County, WAWA946,28831.4−8%

06Yakima County, WAWA259,18531.6+1%

07Kitsap County, WAWA283,37431.8−11%

08Grant County, WAWA105,72732.0+3%

09Benton County, WAWA221,72232.1−7%

10Snohomish County, WAWA870,65632.2−7%

11Island County, WAWA85,65732.3−13%

12Whatcom County, WAWA236,39232.9−3%

13Clark County, WAWA532,11932.9−4%

14Ferry County, WAWA7,51733.0−18%

15Spokane County, WAWA558,34433.1−7%

16Walla Walla County, WAWA62,36133.6−4%

17Douglas County, WAWA46,47333.7−6%

18Skamania County, WAWA12,66933.7−13%

19Thurston County, WAWA304,26133.7−8%

20King County, WAWA2,344,93933.8−5%

21Cowlitz County, WAWA114,88534.3−7%

22Stevens County, WAWA49,66834.5−12%

23Lewis County, WAWA88,06234.9−9%

24Klickitat County, WAWA24,33134.9−12%

25Asotin County, WAWA22,54535.0−10%

26Chelan County, WAWA81,94135.0−4%

27Okanogan County, WAWA45,23035.0−8%

28Grays Harbor County, WAWA78,14435.3−9%

29Skagit County, WAWA132,97535.7−4%

30Pend Oreille County, WAWA14,45736.1−14%

31Mason County, WAWA71,16537.0−8%

32Clallam County, WAWA78,20238.3−12%

33Columbia County, WAWA4,14138.8−8%

34Lincoln County, WAWA11,98239.2−8%

35Wahkiakum County, WAWA4,87340.0−10%

36Pacific County, WAWA24,35740.7−11%

37Jefferson County, WAWA33,97041.1−13%

38Garfield County, WAWA2,41641.1−5%

39San Juan County, WAWA18,57743.4−8%

SHOWING 1–39 OF 39

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