RANKING · 2020 CENSUS · 39 SHOWN OF 39

Youngest by median age, Washington counties · 2020

Washington counties with the youngest median age (2023 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

Flip the list · Oldest by median age, US counties →

WashingtonAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Whitman County, WAWA48,51225.6+4%

02Adams County, WAWA21,48829.7+0%

03Franklin County, WAWA102,61230.9+10%

04Yakima County, WAWA259,18534.2+10%

05Grant County, WAWA105,72734.2+10%

06Benton County, WAWA221,72236.3+6%

07King County, WAWA2,344,93936.9+3%

08Pierce County, WAWA946,28836.9+8%

09Kittitas County, WAWA48,80337.2+18%

10Spokane County, WAWA558,34438.0+7%

11Whatcom County, WAWA236,39238.2+12%

12Snohomish County, WAWA870,65638.2+10%

13Douglas County, WAWA46,47338.4+8%

14Clark County, WAWA532,11938.8+13%

15Walla Walla County, WAWA62,36139.3+13%

16Thurston County, WAWA304,26139.5+8%

17Kitsap County, WAWA283,37439.8+11%

18Chelan County, WAWA81,94141.0+13%

19Cowlitz County, WAWA114,88541.0+11%

20Skagit County, WAWA132,97542.2+13%

21Lewis County, WAWA88,06242.6+11%

22Grays Harbor County, WAWA78,14444.8+15%

23Okanogan County, WAWA45,23044.8+17%

24Asotin County, WAWA22,54545.3+17%

25Island County, WAWA85,65745.8+24%

26Mason County, WAWA71,16545.8+14%

27Klickitat County, WAWA24,33146.0+16%

28Skamania County, WAWA12,66947.0+21%

29Garfield County, WAWA2,41648.1+12%

30Stevens County, WAWA49,66848.3+23%

31Lincoln County, WAWA11,98248.4+13%

32Ferry County, WAWA7,51751.6+29%

33Pend Oreille County, WAWA14,45751.6+23%

34Columbia County, WAWA4,14152.7+24%

35Clallam County, WAWA78,20252.9+21%

36Wahkiakum County, WAWA4,87353.4+20%

37Pacific County, WAWA24,35753.8+17%

38San Juan County, WAWA18,57756.1+18%

39Jefferson County, WAWA33,97059.6+27%

SHOWING 1–39 OF 39

Download CSV (full list, 39 rows)

UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES