| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lovell | 1 | 2,379 | 2,238 | 1.19% | 2,159 | 1 | Town |
| Greybull | 2 | 1,715 | 1,643 | 0.88% | 775 | 2 | Town |
| Basin | 3 | 1,345 | 1,283 | 0.82% | 569 | 2 | Town |
| Cowley | 4 | 876 | 764 | 2.46% | 1,003 | 1 | Town |
| Byron | 5 | 576 | 555 | 0.7% | 636 | 1 | Town |
| Burlington | 6 | 408 | 316 | 3.82% | 404 | 1 | Town |
| Deaver | 7 | 174 | 153 | 2.35% | 172 | 1 | Town |
| Manderson | 8 | 90 | 88 | 0% | 106 | 1 | Town |
Lovell is the largest city in Big Horn County, with a population of 2,379.
Manderson is the smallest city in Big Horn County, with a population of 90.
There are 8 cities in Big Horn County, Wyoming.