| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hot Springs | 1 | 3,731 | 3,396 | 1.66% | 860 | 4 | City |
| Edgemont | 2 | 779 | 730 | 1.17% | 564 | 1 | City |
| Oelrichs | 3 | 129 | 118 | 1.57% | 353 | 0 | Town |
Hot Springs is the largest city in Fall River County, with a population of 3,731.
Oelrichs is the smallest city in Fall River County, with a population of 129.
There are 3 cities in Fall River County, South Dakota.