RANKING · 1990 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 1990

Washington counties ranked by median age of residents (1990 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 33.8.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS –

01San Juan County, WAWA18,57743.4–

02Garfield County, WAWA2,41641.1–

03Jefferson County, WAWA33,97041.1–

04Pacific County, WAWA24,35740.7–

05Wahkiakum County, WAWA4,87340.0–

06Lincoln County, WAWA11,98239.2–

07Columbia County, WAWA4,14138.8–

08Clallam County, WAWA78,20238.3–

09Mason County, WAWA71,16537.0–

10Pend Oreille County, WAWA14,45736.1–

11Skagit County, WAWA132,97535.7–

12Grays Harbor County, WAWA78,14435.3–

13Okanogan County, WAWA45,23035.0–

14Chelan County, WAWA81,94135.0–

15Asotin County, WAWA22,54535.0–

16Klickitat County, WAWA24,33134.9–

17Lewis County, WAWA88,06234.9–

18Stevens County, WAWA49,66834.5–

19Cowlitz County, WAWA114,88534.3–

20King County, WAWA2,344,93933.8–

21Thurston County, WAWA304,26133.7–

22Skamania County, WAWA12,66933.7–

23Douglas County, WAWA46,47333.7–

24Walla Walla County, WAWA62,36133.6–

25Spokane County, WAWA558,34433.1–

26Ferry County, WAWA7,51733.0–

27Clark County, WAWA532,11932.9–

28Whatcom County, WAWA236,39232.9–

29Island County, WAWA85,65732.3–

30Snohomish County, WAWA870,65632.2–

31Benton County, WAWA221,72232.1–

32Grant County, WAWA105,72732.0–

33Kitsap County, WAWA283,37431.8–

34Yakima County, WAWA259,18531.6–

35Pierce County, WAWA946,28831.4–

36Adams County, WAWA21,48830.9–

37Kittitas County, WAWA48,80330.3–

38Franklin County, WAWA102,61228.9–

39Whitman County, WAWA48,51224.4–

SHOWING 1–39 OF 39

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