14 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Riverton | 1 | 11,085 | 10,680 | 0.74% | 1,072 | 10.34 | City |
| Lander | 2 | 7,665 | 7,539 | 0.33% | 817 | 9.38 | City |
| Arapahoe | 3 | 1,581 | 1,701 | -0.32% | 57 | 27.64 | CDP |
| Ethete | 4 | 1,451 | 1,644 | -0.41% | 45 | 32.51 | CDP |
| Fort Washakie | 5 | 1,411 | 1,732 | -1.67% | 68 | 20.89 | CDP |
| Dubois | 6 | 1,044 | 908 | 2.66% | 300 | 3.48 | Town |
| Boulder Flats | 7 | 539 | 342 | 1.7% | 30 | 18.18 | CDP |
| Shoshoni | 8 | 511 | 470 | 1.59% | 143 | 3.58 | Town |
| Hudson | 9 | 437 | 432 | 0.23% | 1,026 | 0.43 | Town |
| Johnstown | 10 | 228 | 221 | -0.44% | 7 | 31.55 | CDP |
| Pavillion | 11 | 226 | 225 | 0% | 1,124 | 0.20 | Town |
| Crowheart | 12 | 182 | 128 | 1.11% | 6 | 31.45 | CDP |
| Jeffrey City | 13 | 43 | 23 | 7.5% | 2 | 28.34 | CDP |
| Atlantic City | 14 | 39 | 0 | 8.33% | 5 | 7.79 | CDP |
Riverton is the largest city in Fremont County, with a population of 11,085.
Atlantic City is the smallest city in Fremont County.
There are 14 cities in Fremont County, Wyoming.