3 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hot Springs | 1 | 3,712 | 3,399 | 1.42% | 855 | 4 | City |
| Edgemont | 2 | 774 | 729 | 1.04% | 560 | 1 | City |
| Oelrichs | 3 | 129 | 119 | 1.57% | 353 | 0 | Town |
Hot Springs is the largest city in Fall River County, with a population of 3,712.
Oelrichs is the smallest city in Fall River County, with a population of 129.
There are 3 cities in Fall River County, South Dakota.