4 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thermopolis | 1 | 2,749 | 2,744 | 0.04% | 1,152 | 2 | Town |
| Lucerne | 2 | 611 | 483 | 0.83% | 30 | 20 | CDP |
| East Thermopolis | 3 | 232 | 230 | 0% | 1,282 | 0 | Town |
| Kirby | 4 | 75 | 75 | 0% | 490 | 0 | Town |
Thermopolis is the largest city in Hot Springs County, with a population of 2,749.
Kirby is the smallest city in Hot Springs County, with a population of 75.
There are 4 cities in Hot Springs County, Wyoming.