| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hiawatha | 1 | 3,094 | 3,251 | -0.96% | 1,194 | 3 | City |
| Horton | 2 | 1,445 | 1,524 | -1.03% | 815 | 2 | City |
| Everest | 3 | 245 | 259 | -1.21% | 1,056 | 0 | City |
| Fairview | 4 | 231 | 239 | -0.86% | 673 | 0 | City |
| Morrill | 5 | 206 | 219 | -1.44% | 1,035 | 0 | City |
| Robinson | 6 | 171 | 182 | -1.16% | 747 | 0 | City |
| Reserve | 7 | 67 | 71 | -1.47% | 583 | 0 | City |
| Powhattan | 8 | 63 | 67 | -1.56% | 460 | 0 | City |
| Leona | 9 | 43 | 40 | 0% | 683 | 0 | City |
| Hamlin | 10 | 35 | 37 | -2.78% | 402 | 0 | City |
| Willis | 11 | 27 | 29 | -3.57% | 165 | 0 | City |
Hiawatha is the largest city in Brown County, with a population of 3,094.
Willis is the smallest city in Brown County, with a population of 27.
There are 11 cities in Brown County, Kansas.