RANKING · 2025 ESTIMATES · 23 SHOWN OF 23

Largest by population, Wyoming counties

The most populous Wyoming counties as of the 2025 population estimates. This list covers the 23 counties in Wyoming that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Laramie County, WYWY102,938+26%

02Natrona County, WYWY80,526+21%

03Campbell County, WYWY48,145+43%

04Sweetwater County, WYWY41,267+10%

05Fremont County, WYWY39,464+10%

06Albany County, WYWY38,558+20%

07Sheridan County, WYWY33,241+25%

08Park County, WYWY31,171+21%

09Teton County, WYWY23,333+28%

10Lincoln County, WYWY21,180+45%

11Uinta County, WYWY20,728+5%

12Carbon County, WYWY14,013−10%

13Converse County, WYWY13,824+15%

14Goshen County, WYWY12,640+1%

15Big Horn County, WYWY12,024+5%

16Sublette County, WYWY8,929+51%

17Johnson County, WYWY8,908+26%

18Platte County, WYWY8,634−2%

19Crook County, WYWY7,852+33%

20Washakie County, WYWY7,597−8%

21Weston County, WYWY6,840+3%

22Hot Springs County, WYWY4,600−6%

23Niobrara County, WYWY2,341−3%

SHOWING 1–23 OF 23

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES