50 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Milbank | 1 | 3,547 | 3,548 | 0.06% | 1,279 | 3 | City |
| Milbank | 2 | 3,547 | 3,534 | 0.06% | 1,279 | 3 | City |
| Alban | 3 | 623 | 611 | 0.65% | 12 | 54 | Township |
| Alban | 4 | 623 | 611 | 0.65% | 12 | 54 | Township |
| Big Stone City | 5 | 413 | 412 | 0% | 345 | 1 | City |
| Big Stone City | 6 | 413 | 410 | 0% | 345 | 1 | City |
| Melrose | 7 | 388 | 377 | 1.31% | 8 | 48 | Township |
| Melrose | 8 | 388 | 378 | 1.31% | 8 | 48 | Township |
| Grant Center | 9 | 382 | 372 | 0.79% | 11 | 36 | Township |
| Grant Center | 10 | 382 | 373 | 0.79% | 11 | 36 | Township |
| Big Stone | 11 | 323 | 317 | 0.62% | 10 | 32 | Township |
| Big Stone | 12 | 323 | 316 | 0.62% | 10 | 32 | Township |
| Vernon | 13 | 220 | 217 | 0% | 4 | 55 | Township |
| Vernon | 14 | 220 | 216 | 0% | 4 | 55 | Township |
| Blooming Valley | 15 | 178 | 177 | 0% | 5 | 36 | Township |
| Blooming Valley | 16 | 178 | 176 | 0% | 5 | 36 | Township |
| Adams | 17 | 160 | 153 | 1.27% | 3 | 55 | Township |
| Adams | 18 | 160 | 152 | 1.27% | 3 | 55 | Township |
| Osceola | 19 | 160 | 156 | 0.63% | 4 | 43 | Township |
| Osceola | 20 | 160 | 156 | 0.63% | 4 | 43 | Township |
| Kilborn | 21 | 150 | 149 | 0% | 4 | 36 | Township |
| Kilborn | 22 | 150 | 148 | 0% | 4 | 36 | Township |
| Stockholm | 23 | 107 | 103 | 0.94% | 247 | 0 | Town |
| Stockholm | 24 | 107 | 102 | 0.94% | 247 | 0 | Town |
| McIntosh | 25 | 106 | 113 | -1.85% | 145 | 1 | City |
| McIntosh | 26 | 106 | 113 | -1.85% | 145 | 1 | City |
| Revillo | 27 | 98 | 99 | 0% | 587 | 0 | Town |
| Revillo | 28 | 98 | 98 | 0% | 587 | 0 | Town |
| Stockholm | 29 | 97 | 95 | 0% | 3 | 35 | Township |
| Stockholm | 30 | 97 | 94 | 0% | 3 | 35 | Township |
| Mazeppa | 31 | 96 | 94 | 0% | 2 | 52 | Township |
| Mazeppa | 32 | 96 | 94 | 0% | 2 | 52 | Township |
| Twin Brooks | 33 | 91 | 91 | -1.09% | 3 | 36 | Township |
| Twin Brooks | 34 | 91 | 91 | -1.09% | 3 | 36 | Township |
| Georgia | 35 | 90 | 85 | 2.27% | 3 | 35 | Township |
| Georgia | 36 | 90 | 85 | 2.27% | 3 | 35 | Township |
| Farmington | 37 | 75 | 73 | 0% | 3 | 22 | Township |
| Farmington | 38 | 75 | 73 | 0% | 3 | 22 | Township |
| Strandburg | 39 | 66 | 65 | 0% | 880 | 0 | Town |
| Strandburg | 40 | 66 | 65 | 0% | 880 | 0 | Town |
| La Bolt | 41 | 62 | 61 | 0% | 261 | 0 | Town |
| La Bolt | 42 | 62 | 61 | 0% | 261 | 0 | Town |
| Troy | 43 | 60 | 55 | 5.26% | 2 | 35 | Township |
| Troy | 44 | 60 | 55 | 5.26% | 2 | 35 | Township |
| Lura | 45 | 55 | 51 | 3.77% | 2 | 32 | Township |
| Lura | 46 | 55 | 51 | 3.77% | 2 | 32 | Township |
| Twin Brooks | 47 | 47 | 46 | 0% | 116 | 0 | Town |
| Twin Brooks | 48 | 47 | 46 | 0% | 116 | 0 | Town |
| Marvin | 49 | 19 | 19 | 0% | 35 | 1 | Town |
| Marvin | 50 | 19 | 19 | 0% | 35 | 1 | Town |
Milbank is the largest city in Grant County, with a population of 3,547.
Marvin is the smallest city in Grant County, with a population of 19.
There are 50 cities in Grant County, South Dakota.