RANKING · 1990 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 1990

Washington counties with the youngest median age (1990 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 33.8.

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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 –

01Whitman County, WAWA48,51224.4–

02Franklin County, WAWA102,61228.9–

03Kittitas County, WAWA48,80330.3–

04Adams County, WAWA21,48830.9–

05Pierce County, WAWA946,28831.4–

06Yakima County, WAWA259,18531.6–

07Kitsap County, WAWA283,37431.8–

08Grant County, WAWA105,72732.0–

09Benton County, WAWA221,72232.1–

10Snohomish County, WAWA870,65632.2–

11Island County, WAWA85,65732.3–

12Whatcom County, WAWA236,39232.9–

13Clark County, WAWA532,11932.9–

14Ferry County, WAWA7,51733.0–

15Spokane County, WAWA558,34433.1–

16Walla Walla County, WAWA62,36133.6–

17Douglas County, WAWA46,47333.7–

18Skamania County, WAWA12,66933.7–

19Thurston County, WAWA304,26133.7–

20King County, WAWA2,344,93933.8–

21Cowlitz County, WAWA114,88534.3–

22Stevens County, WAWA49,66834.5–

23Lewis County, WAWA88,06234.9–

24Klickitat County, WAWA24,33134.9–

25Asotin County, WAWA22,54535.0–

26Chelan County, WAWA81,94135.0–

27Okanogan County, WAWA45,23035.0–

28Grays Harbor County, WAWA78,14435.3–

29Skagit County, WAWA132,97535.7–

30Pend Oreille County, WAWA14,45736.1–

31Mason County, WAWA71,16537.0–

32Clallam County, WAWA78,20238.3–

33Columbia County, WAWA4,14138.8–

34Lincoln County, WAWA11,98239.2–

35Wahkiakum County, WAWA4,87340.0–

36Pacific County, WAWA24,35740.7–

37Jefferson County, WAWA33,97041.1–

38Garfield County, WAWA2,41641.1–

39San Juan County, WAWA18,57743.4–

SHOWING 1–39 OF 39

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