RANKING · 2010 CENSUS · 39 SHOWN OF 39

Largest households, Washington counties · 2010

Washington counties ranked by average household size (2010 ACS). This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

WashingtonAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDMost expensive homes Cheapest homes Highest median rent Lowest median rent Highest homeownership rate Highest renter share

YEAR2010 2020 2024

RANKPLACESTATEPOPAVERAGE HOUSEHOLD SIZEVS –

01Franklin County, WAWA102,6123.29–

02Adams County, WAWA21,4883.15–

03Yakima County, WAWA259,1852.94–

04Grant County, WAWA105,7272.84–

05Ferry County, WAWA7,5172.72–

06Douglas County, WAWA46,4732.68–

07Benton County, WAWA221,7222.67–

08Clark County, WAWA532,1192.65–

09Mason County, WAWA71,1652.63–

10Chelan County, WAWA81,9412.62–

11Snohomish County, WAWA870,6562.60–

12Pierce County, WAWA946,2882.57–

13Okanogan County, WAWA45,2302.54–

14Kitsap County, WAWA283,3742.53–

15Lewis County, WAWA88,0622.52–

16Skagit County, WAWA132,9752.51–

17Cowlitz County, WAWA114,8852.50–

18Walla Walla County, WAWA62,3612.48–

19Stevens County, WAWA49,6682.48–

20Grays Harbor County, WAWA78,1442.47–

21Whatcom County, WAWA236,3922.44–

22Thurston County, WAWA304,2612.44–

23Whitman County, WAWA48,5122.41–

24Skamania County, WAWA12,6692.41–

25Spokane County, WAWA558,3442.41–

26Garfield County, WAWA2,4162.39–

27Klickitat County, WAWA24,3312.37–

28Asotin County, WAWA22,5452.36–

29King County, WAWA2,344,9392.36–

30Pend Oreille County, WAWA14,4572.33–

31Island County, WAWA85,6572.30–

32Columbia County, WAWA4,1412.28–

33Kittitas County, WAWA48,8032.27–

34Lincoln County, WAWA11,9822.26–

35Wahkiakum County, WAWA4,8732.25–

36Clallam County, WAWA78,2022.21–

37Pacific County, WAWA24,3572.16–

38Jefferson County, WAWA33,9702.02–

39San Juan County, WAWA18,5771.94–

SHOWING 1–39 OF 39

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