11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sisseton | 1 | 2,382 | 2,471 | -0.75% | 1,497 | 1.59 | City |
| Wilmot | 2 | 418 | 432 | -0.71% | 784 | 0.53 | City |
| Rosholt | 3 | 362 | 377 | -0.82% | 1,223 | 0.30 | Town |
| Summit | 4 | 271 | 285 | -1.09% | 495 | 0.55 | Town |
| New Effington | 5 | 221 | 233 | -0.9% | 847 | 0.26 | Town |
| Peever | 6 | 171 | 176 | -0.58% | 1,379 | 0.12 | Town |
| Peever Flats | 7 | 134 | 187 | 7.2% | 1,787 | 0.07 | CDP |
| Claire City | 8 | 79 | 83 | -1.25% | 432 | 0.18 | Town |
| Corona | 9 | 68 | 65 | 1.49% | 269 | 0.25 | Town |
| Ortley | 10 | 47 | 49 | 0% | 21 | 2.24 | Town |
| White Rock | 11 | 7 | 7 | 0% | 4 | 1.57 | Town |
Sisseton is the largest city in Roberts County, with a population of 2,382.
White Rock is the smallest city in Roberts County.
There are 11 cities in Roberts County, South Dakota.