RANKING · 2020 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 2020

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, WAWA33,97059.6+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, WAWA21,48829.7+0%

39Whitman County, WAWA48,51225.6+4%

SHOWING 1–39 OF 39

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