Wyoming Towns & Counties, Biggest To Smallest

There is an old joke that in most Wyoming towns, the altitude is higher than the population. This is true. Let's have a look at Wyoming towns - not all of them - and rank them according to population.

Wyoming's ten largest municipalities by population are led by the capital city of Cheyenne (~65,000 residents), followed by Casper (~59,000), Gillette (~33,000), and Laramie (~32,000).

At the other end of the scale, Lost Springs is the smallest incorporated municipality, with just 6 residents.

Scroll down and let's list them by size. Then let's have a look at counties and their populations.

TOP TEN:

Cheyenne: 65,132
Casper: 58,839
Gillette: 33,431
Laramie: 32,234
Rock Springs: ~23,500
Sheridan: ~19,000
Green River: ~11,500
Evanston: ~11,500
Jackson: ~10,000
Riverton: ~9,000

Would you like to see them all? That's quite a list, but it is available online at this link.

Wyoming's 10 smallest communities by population are...

Lost Springs – Population: 6
Kirby – Population: 92
Manville – Population: 92
Hartville – Population: 62
Orin – Population: 30
Aladdin – Population: 15
Manvill - Populatin 90
Encampment – Population: ~450

Wyoming's five largest counties by population are Laramie (102,938), Natrona (80,526), Campbell (48,145), Sweetwater (41,267), and Fremont (39,700).

Wyoming's least populous county is Niobrara County, with an estimated 2026 population of 2,367 residents. The second and third smallest are Hot Springs County (~4,600 residents) and Weston County (~6,840 residents), based on recent U.S. Census Bureau and Federal Reserve economic data.

The total population of Wyoming in 2026 is estimated to be approximately 590,784, making it the least populous state in the U.S. This reflects a slight annualized growth rate of about 0.34%, with the U.S. Census Bureau also tracking a baseline of 576,851 from recent profile data.