RANKING · 2025 ESTIMATES · 23 SHOWN OF 23

Fastest shrinking, Wyoming counties

Wyoming counties with the steepest population decline from the 2020 census to 2025. This list covers the 23 counties in Wyoming that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Niobrara County, WYWY2,341-5.1%+39%

02Carbon County, WYWY14,013-3.6%−41%

03Sweetwater County, WYWY41,267-2.4%−24%

04Washakie County, WYWY7,597-1.1%−3%

05Hot Springs County, WYWY4,600-0.5%−130%

06Teton County, WYWY23,333+0.0%−100%

07Weston County, WYWY6,840+0.0%−98%

08Platte County, WYWY8,634+0.3%−96%

09Converse County, WYWY13,824+0.5%−94%

10Fremont County, WYWY39,464+0.6%−91%

11Natrona County, WYWY80,526+0.7%−92%

12Goshen County, WYWY12,640+1.1%−15%

13Uinta County, WYWY20,728+1.4%−75%

14Sublette County, WYWY8,929+2.3%−90%

15Campbell County, WYWY48,145+2.4%−84%

16Laramie County, WYWY102,938+2.4%−79%

17Albany County, WYWY38,558+4.0%+2%

18Big Horn County, WYWY12,024+4.4%−51%

19Park County, WYWY31,171+5.2%−54%

20Johnson County, WYWY8,908+5.5%−64%

21Sheridan County, WYWY33,241+7.5%−41%

22Lincoln County, WYWY21,180+8.2%−47%

23Crook County, WYWY7,852+9.3%−17%

SHOWING 1–23 OF 23

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