7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hot Springs | 1 | 3,755 | 3,390 | 1.98% | 865 | 4.34 | City |
| Edgemont | 2 | 790 | 732 | 1.54% | 572 | 1.38 | City |
| Oelrichs | 3 | 131 | 118 | 2.34% | 359 | 0.36 | Town |
| Oral | 4 | 55 | 73 | 7.84% | 33 | 1.67 | CDP |
| Provo township | 5 | 34 | 32 | 0% | 1 | 35.53 | Township |
| Smithwick | 6 | 24 | 11 | 9.09% | 12 | 1.93 | CDP |
| Argentine township | 7 | 19 | 18 | 0% | 1 | 35.80 | Township |
Hot Springs is the largest city in Fall River County, with a population of 3,755.
Argentine township is the smallest city in Fall River County.
There are 7 cities in Fall River County, South Dakota.