RANKING · 2000 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 2000

Washington counties with the youngest median age (2000 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 37.0.

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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 1990

01Whitman County, WAWA48,51224.7+1%

02Franklin County, WAWA102,61228.0−3%

03Adams County, WAWA21,48829.6−4%

04Grant County, WAWA105,72731.1−3%

05Yakima County, WAWA259,18531.2−1%

06Kittitas County, WAWA48,80331.4+4%

07Whatcom County, WAWA236,39234.0+3%

08Pierce County, WAWA946,28834.1+9%

09Clark County, WAWA532,11934.2+4%

10Benton County, WAWA221,72234.4+7%

11Snohomish County, WAWA870,65634.7+8%

12Walla Walla County, WAWA62,36134.9+4%

13Spokane County, WAWA558,34435.4+7%

14Douglas County, WAWA46,47335.7+6%

15King County, WAWA2,344,93935.7+6%

16Kitsap County, WAWA283,37435.8+13%

17Chelan County, WAWA81,94136.3+4%

18Thurston County, WAWA304,26136.5+8%

19Cowlitz County, WAWA114,88536.9+8%

20Island County, WAWA85,65737.0+15%

21Skagit County, WAWA132,97537.2+4%

22Okanogan County, WAWA45,23038.2+9%

23Lewis County, WAWA88,06238.4+10%

24Skamania County, WAWA12,66938.7+15%

25Asotin County, WAWA22,54538.8+11%

26Grays Harbor County, WAWA78,14438.8+10%

27Stevens County, WAWA49,66839.2+14%

28Klickitat County, WAWA24,33139.5+13%

29Ferry County, WAWA7,51740.0+21%

30Mason County, WAWA71,16540.3+9%

31Pend Oreille County, WAWA14,45741.9+16%

32Columbia County, WAWA4,14142.4+9%

33Lincoln County, WAWA11,98242.8+9%

34Garfield County, WAWA2,41643.0+5%

35Clallam County, WAWA78,20243.8+14%

36Wahkiakum County, WAWA4,87344.4+11%

37Pacific County, WAWA24,35745.8+13%

38Jefferson County, WAWA33,97047.1+15%

39San Juan County, WAWA18,57747.4+9%

SHOWING 1–39 OF 39

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