RANKING · 2010 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 2010

Washington counties ranked by median age of residents (2010 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 40.2.

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SAME RANKING BYCities States Metros ZIP codes

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