RANKING · 2020 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 2020

Washington counties ranked by median age of residents (2020 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 42.2.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Jefferson County, WAWA33,97059.6+27%

02San Juan County, WAWA18,57756.1+18%

03Pacific County, WAWA24,35753.8+17%

04Wahkiakum County, WAWA4,87353.4+20%

05Clallam County, WAWA78,20252.9+21%

06Columbia County, WAWA4,14152.7+24%

07Ferry County, WAWA7,51751.6+29%

08Pend Oreille County, WAWA14,45751.6+23%

09Lincoln County, WAWA11,98248.4+13%

10Stevens County, WAWA49,66848.3+23%

11Garfield County, WAWA2,41648.1+12%

12Skamania County, WAWA12,66947.0+21%

13Klickitat County, WAWA24,33146.0+16%

14Island County, WAWA85,65745.8+24%

15Mason County, WAWA71,16545.8+14%

16Asotin County, WAWA22,54545.3+17%

17Grays Harbor County, WAWA78,14444.8+15%

18Okanogan County, WAWA45,23044.8+17%

19Lewis County, WAWA88,06242.6+11%

20Skagit County, WAWA132,97542.2+13%

21Chelan County, WAWA81,94141.0+13%

22Cowlitz County, WAWA114,88541.0+11%

23Kitsap County, WAWA283,37439.8+11%

24Thurston County, WAWA304,26139.5+8%

25Walla Walla County, WAWA62,36139.3+13%

26Clark County, WAWA532,11938.8+13%

27Douglas County, WAWA46,47338.4+8%

28Whatcom County, WAWA236,39238.2+12%

29Snohomish County, WAWA870,65638.2+10%

30Spokane County, WAWA558,34438.0+7%

31Kittitas County, WAWA48,80337.2+18%

32King County, WAWA2,344,93936.9+3%

33Pierce County, WAWA946,28836.9+8%

34Benton County, WAWA221,72236.3+6%

35Yakima County, WAWA259,18534.2+10%

36Grant County, WAWA105,72734.2+10%

37Franklin County, WAWA102,61230.9+10%

38Adams County, WAWA21,48829.70%

39Whitman County, WAWA48,51225.6+4%

SHOWING 1–39 OF 39

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