RANKING · 2000 CENSUS · 39 SHOWN OF 39

Oldest by median age, Washington counties · 2000

Washington counties ranked by median age of residents (2000 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 37.0.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 1990

01San Juan County, WAWA18,57747.4+9%

02Jefferson County, WAWA33,97047.1+15%

03Pacific County, WAWA24,35745.8+13%

04Wahkiakum County, WAWA4,87344.4+11%

05Clallam County, WAWA78,20243.8+14%

06Garfield County, WAWA2,41643.0+5%

07Lincoln County, WAWA11,98242.8+9%

08Columbia County, WAWA4,14142.4+9%

09Pend Oreille County, WAWA14,45741.9+16%

10Mason County, WAWA71,16540.3+9%

11Ferry County, WAWA7,51740.0+21%

12Klickitat County, WAWA24,33139.5+13%

13Stevens County, WAWA49,66839.2+14%

14Asotin County, WAWA22,54538.8+11%

15Grays Harbor County, WAWA78,14438.8+10%

16Skamania County, WAWA12,66938.7+15%

17Lewis County, WAWA88,06238.4+10%

18Okanogan County, WAWA45,23038.2+9%

19Skagit County, WAWA132,97537.2+4%

20Island County, WAWA85,65737.0+15%

21Cowlitz County, WAWA114,88536.9+8%

22Thurston County, WAWA304,26136.5+8%

23Chelan County, WAWA81,94136.3+4%

24Kitsap County, WAWA283,37435.8+13%

25Douglas County, WAWA46,47335.7+6%

26King County, WAWA2,344,93935.7+6%

27Spokane County, WAWA558,34435.4+7%

28Walla Walla County, WAWA62,36134.9+4%

29Snohomish County, WAWA870,65634.7+8%

30Benton County, WAWA221,72234.4+7%

31Clark County, WAWA532,11934.2+4%

32Pierce County, WAWA946,28834.1+9%

33Whatcom County, WAWA236,39234.0+3%

34Kittitas County, WAWA48,80331.4+4%

35Yakima County, WAWA259,18531.2−1%

36Grant County, WAWA105,72731.1−3%

37Adams County, WAWA21,48829.6−4%

38Franklin County, WAWA102,61228.0−3%

39Whitman County, WAWA48,51224.7+1%

SHOWING 1–39 OF 39

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