27 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hiawatha | 1 | 3,141 | 3,263 | -0.76% | 1,212 | 2.59 | City |
| Fairview township | 2 | 1,665 | 1,630 | 0.36% | 62 | 27.02 | Township |
| Horton | 3 | 1,453 | 1,520 | -0.89% | 820 | 1.77 | City |
| Powhattan township | 4 | 818 | 859 | -1.33% | 9 | 89.74 | Township |
| Hiawatha township | 5 | 577 | 605 | -1.2% | 9 | 63.09 | Township |
| Fairview township | 6 | 490 | 481 | 0.41% | 14 | 36.08 | Township |
| Morrill township | 7 | 460 | 481 | -1.08% | 11 | 40.80 | Township |
| Fairview township | 8 | 438 | 426 | 0.46% | 6 | 71.17 | Township |
| Robinson township | 9 | 349 | 371 | -1.69% | 8 | 44.71 | Township |
| Irving township | 10 | 297 | 311 | -1.33% | 6 | 53.03 | Township |
| Fairview township | 11 | 282 | 281 | 0.36% | 4 | 72.66 | Township |
| Fairview township | 12 | 277 | 283 | 0% | 8 | 35.99 | Township |
| Hamlin township | 13 | 271 | 294 | -2.52% | 7 | 40.81 | Township |
| Everest | 14 | 250 | 259 | -0.79% | 1,078 | 0.23 | City |
| Fairview | 15 | 234 | 239 | -0.43% | 682 | 0.34 | City |
| Fairview township | 16 | 210 | 222 | -1.87% | 6 | 35.96 | Township |
| Morrill | 17 | 209 | 219 | -0.95% | 1,050 | 0.20 | City |
| Padonia township | 18 | 175 | 183 | -1.13% | 4 | 41.24 | Township |
| Robinson | 19 | 171 | 181 | -1.16% | 747 | 0.23 | City |
| Fairview township | 20 | 126 | 126 | 0% | 3 | 36.42 | Township |
| Fairview township | 21 | 100 | 103 | -0.99% | 3 | 36.19 | Township |
| Fairview township | 22 | 73 | 84 | -5.19% | 2 | 35.92 | Township |
| Reserve | 23 | 67 | 71 | -1.47% | 583 | 0.12 | City |
| Powhattan | 24 | 65 | 69 | -1.52% | 474 | 0.14 | City |
| Leona | 25 | 38 | 38 | 0% | 603 | 0.06 | City |
| Hamlin | 26 | 23 | 25 | 0% | 264 | 0.09 | City |
| Willis | 27 | 22 | 24 | 0% | 134 | 0.16 | City |
Hiawatha is the largest city in Brown County, with a population of 3,141.
Willis is the smallest city in Brown County.
There are 27 cities in Brown County, Kansas.