RANKING · 2010 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 2010

Washington counties ranked by median age of residents (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

RELATEDYoungest 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

01Jefferson County, WAWA33,97053.9+14%

02San Juan County, WAWA18,57752.7+11%

03Wahkiakum County, WAWA4,87352.3+18%

04Pacific County, WAWA24,35750.8+11%

05Clallam County, WAWA78,20249.0+12%

06Garfield County, WAWA2,41649.0+14%

07Columbia County, WAWA4,14148.3+14%

08Pend Oreille County, WAWA14,45747.8+14%

09Lincoln County, WAWA11,98247.6+11%

10Ferry County, WAWA7,51747.3+18%

11Klickitat County, WAWA24,33145.3+15%

12Stevens County, WAWA49,66845.0+15%

13Mason County, WAWA71,16544.4+10%

14Skamania County, WAWA12,66944.0+14%

15Asotin County, WAWA22,54543.5+12%

16Island County, WAWA85,65743.2+17%

17Okanogan County, WAWA45,23042.9+12%

18Grays Harbor County, WAWA78,14441.9+8%

19Lewis County, WAWA88,06241.5+8%

20Cowlitz County, WAWA114,88540.2+9%

21Skagit County, WAWA132,97540.1+8%

22Kitsap County, WAWA283,37439.4+10%

23Chelan County, WAWA81,94139.3+8%

24Thurston County, WAWA304,26138.5+5%

25King County, WAWA2,344,93937.1+4%

26Snohomish County, WAWA870,65637.1+7%

27Douglas County, WAWA46,47336.8+3%

28Spokane County, WAWA558,34436.8+4%

29Walla Walla County, WAWA62,36136.7+5%

30Clark County, WAWA532,11936.7+7%

31Whatcom County, WAWA236,39236.6+8%

32Pierce County, WAWA946,28835.9+5%

33Benton County, WAWA221,72235.6+3%

34Yakima County, WAWA259,18532.2+3%

35Grant County, WAWA105,72732.1+3%

36Kittitas County, WAWA48,80331.9+2%

37Adams County, WAWA21,48829.0−2%

38Franklin County, WAWA102,61228.4+1%

39Whitman County, WAWA48,51224.4−1%

SHOWING 1–39 OF 39

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