13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Riverton | 1 | 11,018 | 10,693 | 0.59% | 1,066 | 10 | City |
| Lander | 2 | 7,462 | 7,406 | 0.15% | 795 | 9 | City |
| Arapahoe | 3 | 1,581 | 1,701 | -0.32% | 57 | 28 | CDP |
| Ethete | 4 | 1,451 | 1,644 | -0.41% | 45 | 33 | CDP |
| Fort Washakie | 5 | 1,411 | 1,732 | -1.67% | 68 | 21 | CDP |
| Dubois | 6 | 1,009 | 906 | 2.02% | 290 | 3 | Town |
| Boulder Flats | 7 | 539 | 342 | 1.7% | 30 | 18 | CDP |
| Shoshoni | 8 | 507 | 469 | 1.4% | 142 | 4 | Town |
| Hudson | 9 | 437 | 432 | 0.23% | 1,026 | 0 | Town |
| Pavillion | 10 | 230 | 225 | 0.44% | 1,144 | 0 | Town |
| Johnstown | 11 | 228 | 221 | -0.44% | 7 | 32 | CDP |
| Crowheart | 12 | 182 | 128 | 1.11% | 6 | 31 | CDP |
| Jeffrey City | 13 | 43 | 23 | 7.5% | 2 | 28 | CDP |
Riverton is the largest city in Fremont County, with a population of 11,018.
Jeffrey City is the smallest city in Fremont County, with a population of 43.
There are 13 cities in Fremont County, Wyoming.