RANKING · 2020 CENSUS · 39 SHOWN OF 39

Fastest growing, Washington counties · 2020

Washington counties ranked by population growth from the 2010 census to 2020. This list covers the 39 counties in Washington that qualify, ranked against each other statewide.

Flip the list · Fastest shrinking, US counties →

WashingtonAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Franklin County, WAWA102,612+23.8%−7.9 pts

02Clark County, WAWA532,119+18.3%−26.7 pts

03Benton County, WAWA221,722+18.1%−8.5 pts

04King County, WAWA2,344,939+17.5%+2.3 pts

05Thurston County, WAWA304,261+16.9%−11.7 pts

06Snohomish County, WAWA870,656+16.1%−14.1 pts

07Pierce County, WAWA946,288+15.8%−3.7 pts

08Spokane County, WAWA558,344+14.5%−1.2 pts

09San Juan County, WAWA18,577+12.8%−27.5 pts

10Whatcom County, WAWA236,392+12.8%−17.8 pts

11Klickitat County, WAWA24,331+11.9%−3.4 pts

12Douglas County, WAWA46,473+11.7%−12.7 pts

13Pacific County, WAWA24,357+11.7%+0.6 pts

14Grant County, WAWA105,727+11.2%−25.2 pts

15Wahkiakum County, WAWA4,873+11.2%−3.8 pts

16Skagit County, WAWA132,975+10.8%−18.6 pts

17Island County, WAWA85,657+10.6%−8.2 pts

18Jefferson County, WAWA33,970+10.4%−18.4 pts

19Adams County, WAWA21,488+10.1%−10.7 pts

20Kitsap County, WAWA283,374+9.7%−12.5 pts

21Chelan County, WAWA81,941+9.1%−18.4 pts

22Lewis County, WAWA88,062+8.9%−6.7 pts

23Skamania County, WAWA12,669+8.8%−10.3 pts

24Kittitas County, WAWA48,803+8.4%−16.5 pts

25Mason County, WAWA71,165+8.3%−20.6 pts

26Cowlitz County, WAWA114,885+8.1%−5.1 pts

27Clallam County, WAWA78,202+8.1%−6.2 pts

28Whitman County, WAWA48,512+7.1%+2.1 pts

29Stevens County, WAWA49,668+6.7%−22.8 pts

30Walla Walla County, WAWA62,361+6.5%−7.4 pts

31Yakima County, WAWA259,185+5.5%−12.3 pts

32Grays Harbor County, WAWA78,144+3.9%−0.8 pts

33Pend Oreille County, WAWA14,457+3.1%−28.5 pts

34Asotin County, WAWA22,545+3.1%−13.7 pts

35Lincoln County, WAWA11,982+2.9%−12.0 pts

36Okanogan County, WAWA45,230+2.4%−16.2 pts

37Garfield County, WAWA2,416+0.9%−5.7 pts

38Columbia County, WAWA4,141-3.1%−4.1 pts

39Ferry County, WAWA7,517-4.9%−20.3 pts

SHOWING 1–39 OF 39

Download CSV (full list, 39 rows)

UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS