RANKING · 2025 ESTIMATES · 23 SHOWN OF 23

Most population lost, Wyoming counties

Wyoming counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 23 counties in Wyoming that qualify, ranked against each other statewide. The median across all 23 is +230. Biggest climber in the top 100 since 2020: Teton County, WY, up 15 places to #6.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Sweetwater County, WYWY41,267-1,005−17%

02▲1Carbon County, WYWY14,013-524−49%

03▲11Niobrara County, WYWY2,341-126+37%

04▲1Washakie County, WYWY7,597-88−11%

05▲4Hot Springs County, WYWY4,600-21−129%

06▲15Teton County, WYWY23,333+2−100%

07▲1Weston County, WYWY6,840+2−98%

08▲5Platte County, WYWY8,634+29−96%

09▲3Converse County, WYWY13,824+73−92%

10▼4Goshen County, WYWY12,640+142−14%

11▼9Sublette County, WYWY8,929+201−81%

12▼8Fremont County, WYWY39,464+230−89%

13▼6Uinta County, WYWY20,728+278−73%

14▼3Johnson County, WYWY8,908+461−50%

15▼5Big Horn County, WYWY12,024+503−46%

16▲6Natrona County, WYWY80,526+571−89%

17▼2Crook County, WYWY7,852+671+13%

18▼1Campbell County, WYWY48,145+1,119−74%

19▼3Albany County, WYWY38,558+1,492+23%

20▼2Park County, WYWY31,171+1,547−41%

21▼2Lincoln County, WYWY21,180+1,599−18%

22▼2Sheridan County, WYWY33,241+2,320−23%

23Laramie County, WYWY102,938+2,426−71%

SHOWING 1–23 OF 23

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES