41 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sisseton | 1 | 2,421 | 2,473 | -0.45% | 1,522 | 2 | City |
| Goodwill | 2 | 920 | 907 | 0.44% | 25 | 36 | Township |
| Sisseton | 3 | 792 | 780 | 0.64% | 23 | 34 | Township |
| Long Hollow | 4 | 424 | 415 | 0.47% | 12 | 36 | Township |
| Wilmot | 5 | 424 | 433 | -0.47% | 795 | 1 | City |
| Rosholt | 6 | 370 | 380 | -0.54% | 1,250 | 0 | Town |
| Lockwood | 7 | 367 | 356 | 1.1% | 17 | 22 | Township |
| Agency | 8 | 316 | 301 | 1.61% | 9 | 36 | Township |
| Geneseo | 9 | 297 | 285 | 1.02% | 9 | 34 | Township |
| Summit | 10 | 276 | 284 | -0.72% | 504 | 1 | Town |
| Lake | 11 | 265 | 258 | 0.76% | 7 | 37 | Township |
| Lawrence | 12 | 228 | 224 | 0.44% | 10 | 22 | Township |
| New Effington | 13 | 226 | 233 | -0.88% | 866 | 0 | Town |
| Summit | 14 | 185 | 185 | -1.07% | 5 | 35 | Township |
| Grant | 15 | 173 | 171 | 0% | 5 | 36 | Township |
| Peever | 16 | 173 | 176 | -0.57% | 1,395 | 0 | Town |
| Victor | 17 | 164 | 160 | 0.61% | 3 | 47 | Township |
| Harmon | 18 | 153 | 150 | 0.66% | 2 | 62 | Township |
| Easter | 19 | 146 | 144 | 0% | 4 | 33 | Township |
| Spring Grove | 20 | 146 | 141 | 0.69% | 4 | 36 | Township |
| White Rock | 21 | 131 | 127 | 0.77% | 2 | 58 | Township |
| Garfield | 22 | 124 | 123 | 0% | 4 | 35 | Township |
| Lien | 23 | 123 | 121 | 0% | 3 | 47 | Township |
| Becker | 24 | 118 | 113 | 2.61% | 4 | 28 | Township |
| Springdale | 25 | 111 | 110 | 0.91% | 3 | 35 | Township |
| Dry Wood Lake | 26 | 104 | 104 | 0% | 3 | 32 | Township |
| Minnesota | 27 | 103 | 103 | 0% | 2 | 47 | Township |
| Enterprise | 28 | 102 | 102 | 0% | 3 | 36 | Township |
| Hart | 29 | 101 | 101 | 0% | 3 | 36 | Township |
| Norway | 30 | 90 | 90 | 0% | 2 | 48 | Township |
| Ortley | 31 | 87 | 86 | 0% | 3 | 34 | Township |
| Claire City | 32 | 81 | 84 | -1.22% | 443 | 0 | Town |
| Sisseton | 33 | 71 | 68 | 0% | 2 | 35 | Township |
| Corona | 34 | 71 | 66 | 1.43% | 281 | 0 | Town |
| Lee | 35 | 68 | 68 | 0% | 2 | 28 | Township |
| One Road | 36 | 62 | 61 | 0% | 2 | 34 | Township |
| Alto | 37 | 58 | 53 | 5.45% | 2 | 35 | Township |
| Ortley | 38 | 50 | 49 | 0% | 22 | 2 | Town |
| Bossko | 39 | 49 | 48 | 0% | 1 | 36 | Township |
| Summit | 40 | 37 | 34 | 5.71% | 1 | 32 | Township |
| White Rock | 41 | 7 | 7 | 0% | 4 | 2 | Town |
Sisseton is the largest city in Roberts County, with a population of 2,421.
White Rock is the smallest city in Roberts County, with a population of 7.
There are 41 cities in Roberts County, South Dakota.