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. The median across all 39 is 42.1.

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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%

05▲2Ferry County, WAWA7,51752.9+32%

06▼1Clallam County, WAWA78,20252.1+19%

07▲1Pend Oreille County, WAWA14,45749.8+19%

08▼2Columbia County, WAWA4,14149.6+17%

09▲3Skamania County, WAWA12,66948.5+25%

10▲1Garfield County, WAWA2,41647.8+11%

11▼2Lincoln County, WAWA11,98246.9+10%

12▼2Stevens County, WAWA49,66846.9+20%

13Klickitat County, WAWA24,33146.8+18%

14▲2Asotin County, WAWA22,54546.2+19%

15▼1Island County, WAWA85,65744.8+21%

16▲1Grays Harbor County, WAWA78,14444.7+15%

17▼2Mason County, WAWA71,16544.7+11%

18Okanogan County, WAWA45,23043.2+13%

19Lewis County, WAWA88,06242.2+10%

20Skagit County, WAWA132,97542.1+13%

21▲1Cowlitz County, WAWA114,88541.5+12%

22▼1Chelan County, WAWA81,94140.4+11%

23Kitsap County, WAWA283,37440.2+12%

24Thurston County, WAWA304,26140.0+10%

25▲1Clark County, WAWA532,11939.1+14%

26▲1Douglas County, WAWA46,47338.9+9%

27▲2Snohomish County, WAWA870,65638.6+11%

28▼3Walla Walla County, WAWA62,36138.5+10%

29▲1Spokane County, WAWA558,34438.5+9%

30▼2Whatcom County, WAWA236,39238.4+13%

31▲1King County, WAWA2,344,93937.4+5%

32▲1Pierce County, WAWA946,28837.0+9%

33▲1Benton County, WAWA221,72236.3+6%

34▼3Kittitas County, WAWA48,80335.8+14%

35▲1Grant County, WAWA105,72733.7+8%

36▼1Yakima 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 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES