RANKING · 1990 CENSUS · 23 SHOWN OF 23

Largest by population, Wyoming counties · 1990

The most populous Wyoming counties as of the 1990 population estimates. This list covers the 23 counties in Wyoming that qualify, ranked against each other statewide. The median across all 23 is 12,373.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS –

01Laramie County, WYWY73,142–

02Natrona County, WYWY61,226–

03Sweetwater County, WYWY38,823–

04Fremont County, WYWY33,662–

05Albany County, WYWY30,797–

06Campbell County, WYWY29,370–

07Sheridan County, WYWY23,562–

08Park County, WYWY23,178–

09Uinta County, WYWY18,705–

10Carbon County, WYWY16,659–

11Lincoln County, WYWY12,625–

12Goshen County, WYWY12,373–

13Teton County, WYWY11,172–

14Converse County, WYWY11,128–

15Big Horn County, WYWY10,525–

16Washakie County, WYWY8,388–

17Platte County, WYWY8,145–

18Weston County, WYWY6,518–

19Johnson County, WYWY6,145–

20Crook County, WYWY5,294–

21Sublette County, WYWY4,843–

22Hot Springs County, WYWY4,809–

23Niobrara County, WYWY2,499–

SHOWING 1–23 OF 23

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS