RANKING · 2024 ACS · 39 SHOWN OF 39

Oldest by median age, Washington counties

Washington counties ranked by median age of residents (2024 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

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 2000

01Jefferson County, WAWA33,97059.8+27%

02San Juan County, WAWA18,57757.0+20%

03Pacific County, WAWA24,35755.0+20%

04Wahkiakum County, WAWA4,87354.5+23%

05Ferry County, WAWA7,51752.9+32%

06Clallam County, WAWA78,20252.1+19%

07Pend Oreille County, WAWA14,45749.8+19%

08Columbia County, WAWA4,14149.6+17%

09Skamania County, WAWA12,66948.5+25%

10Garfield County, WAWA2,41647.8+11%

11Lincoln County, WAWA11,98246.9+10%

12Stevens County, WAWA49,66846.9+20%

13Klickitat County, WAWA24,33146.8+18%

14Asotin County, WAWA22,54546.2+19%

15Island County, WAWA85,65744.8+21%

16Grays Harbor County, WAWA78,14444.7+15%

17Mason County, WAWA71,16544.7+11%

18Okanogan County, WAWA45,23043.2+13%

19Lewis County, WAWA88,06242.2+10%

20Skagit County, WAWA132,97542.1+13%

21Cowlitz County, WAWA114,88541.5+12%

22Chelan County, WAWA81,94140.4+11%

23Kitsap County, WAWA283,37440.2+12%

24Thurston County, WAWA304,26140.0+10%

25Clark County, WAWA532,11939.1+14%

26Douglas County, WAWA46,47338.9+9%

27Snohomish County, WAWA870,65638.6+11%

28Walla Walla County, WAWA62,36138.5+10%

29Spokane County, WAWA558,34438.5+9%

30Whatcom County, WAWA236,39238.4+13%

31King County, WAWA2,344,93937.4+5%

32Pierce County, WAWA946,28837.0+9%

33Benton County, WAWA221,72236.3+6%

34Kittitas County, WAWA48,80335.8+14%

35Grant County, WAWA105,72733.7+8%

36Yakima County, WAWA259,18533.3+7%

37Franklin County, WAWA102,61230.9+10%

38Adams County, WAWA21,48829.3−1%

39Whitman County, WAWA48,51226.4+7%

SHOWING 1–39 OF 39

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES