| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Coffeyville | 1 | 8,391 | 8,795 | -0.82% | 872 | 10 | City |
| Independence | 2 | 8,122 | 8,542 | -0.87% | 1,083 | 8 | City |
| Cherryvale | 3 | 2,076 | 2,173 | -0.81% | 1,036 | 2 | City |
| Caney | 4 | 1,688 | 1,780 | -0.94% | 1,249 | 1 | City |
| Dearing | 5 | 368 | 385 | -0.81% | 243 | 2 | City |
| Elk City | 6 | 245 | 256 | -0.81% | 725 | 0 | City |
| Tyro | 7 | 160 | 171 | -1.23% | 350 | 0 | City |
| Liberty | 8 | 94 | 99 | -1.05% | 375 | 0 | City |
| Havana | 9 | 81 | 83 | -1.22% | 516 | 0 | City |
Coffeyville is the largest city in Montgomery County, with a population of 8,391.
Havana is the smallest city in Montgomery County, with a population of 81.
There are 9 cities in Montgomery County, Kansas.