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.

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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 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 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS