| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Thermopolis | 1 | 2,719 | 2,734 | -0.07% | 1,139 | 2 | Town |
| East Thermopolis | 2 | 231 | 230 | 0% | 1,276 | 0 | Town |
| Kirby | 3 | 66 | 68 | -1.49% | 431 | 0 | Town |
Thermopolis is the largest city in Hot Springs County, with a population of 2,719.
Kirby is the smallest city in Hot Springs County, with a population of 66.
There are 3 cities in Hot Springs County, Wyoming.