11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Goodland | 1 | 4,355 | 4,472 | -0.43% | 968 | 5 | City |
| Itasca | 2 | 286 | 290 | 0.35% | 8 | 34 | Township |
| Voltaire | 3 | 226 | 227 | 0% | 1 | 159 | Township |
| Stateline | 4 | 218 | 223 | 0% | 3 | 64 | Township |
| Kanorado | 5 | 149 | 152 | 0% | 571 | 0 | City |
| Smoky | 6 | 79 | 81 | 0% | 1 | 108 | Township |
| Grant | 7 | 65 | 70 | -1.52% | 0.00 | 137 | Township |
| Union | 8 | 57 | 58 | 0% | 1 | 54 | Township |
| Llanos | 9 | 36 | 37 | 0% | 1 | 71 | Township |
| Shermanville | 10 | 29 | 30 | 0% | 0.00 | 71 | Township |
| Iowa | 11 | 27 | 25 | 3.85% | 0.00 | 108 | Township |
Goodland is the largest city in Sherman County, with a population of 4,355.
Iowa is the smallest city in Sherman County, with a population of 27.
There are 11 cities in Sherman County, Kansas.