4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thermopolis | 1 | 2,755 | 2,722 | 0.26% | 1,154 | 2.39 | Town |
| Lucerne | 2 | 611 | 483 | 0.83% | 30 | 20.07 | CDP |
| East Thermopolis | 3 | 239 | 231 | 0.84% | 1,320 | 0.18 | Town |
| Kirby | 4 | 76 | 75 | 0% | 497 | 0.15 | Town |
Thermopolis is the largest city in Hot Springs County, with a population of 2,755.
Kirby is the smallest city in Hot Springs County.
There are 4 cities in Hot Springs County, Wyoming.