23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Goodland | 1 | 4,374 | 4,495 | -0.46% | 972 | 5 | City |
| Goodland | 2 | 4,374 | 4,472 | -0.46% | 972 | 5 | City |
| Itasca | 3 | 285 | 292 | 0.35% | 8 | 34 | Township |
| Itasca | 4 | 285 | 290 | 0.35% | 8 | 34 | Township |
| Voltaire | 5 | 226 | 228 | 0% | 1 | 159 | Township |
| Voltaire | 6 | 226 | 227 | 0% | 1 | 159 | Township |
| Stateline | 7 | 218 | 224 | 0% | 3 | 64 | Township |
| Stateline | 8 | 218 | 223 | 0% | 3 | 64 | Township |
| Kanorado | 9 | 149 | 153 | -0.67% | 571 | 0 | City |
| Kanorado | 10 | 149 | 152 | -0.67% | 571 | 0 | City |
| Smoky | 11 | 79 | 81 | 0% | 1 | 108 | Township |
| Smoky | 12 | 79 | 81 | 0% | 1 | 108 | Township |
| Grant | 13 | 66 | 70 | -1.49% | 0.00 | 137 | Township |
| Grant | 14 | 66 | 70 | -1.49% | 0.00 | 137 | Township |
| Union | 15 | 57 | 58 | 0% | 1 | 54 | Township |
| Union | 16 | 57 | 58 | 0% | 1 | 54 | Township |
| Llanos | 17 | 36 | 37 | 0% | 1 | 71 | Township |
| Llanos | 18 | 36 | 37 | 0% | 1 | 71 | Township |
| Shermanville | 19 | 29 | 30 | 0% | 0.00 | 71 | Township |
| Shermanville | 20 | 29 | 30 | 0% | 0.00 | 71 | Township |
| Iowa | 21 | 26 | 25 | 4% | 0.00 | 108 | Township |
| Iowa | 22 | 26 | 25 | 4% | 0.00 | 108 | Township |
| Edson | 23 | 11 | 14 | 10% | 16 | 1 | CDP |
Goodland is the largest city in Sherman County, with a population of 4,374.
Edson is the smallest city in Sherman County, with a population of 11.
There are 23 cities in Sherman County, Kansas.