12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Red Oak | 1 | 5,376 | 5,596 | -0.81% | 1,369 | 4 | City |
| Red Oak | 2 | 5,376 | 5,596 | -0.81% | 1,369 | 4 | City |
| Villisca | 3 | 1,099 | 1,131 | -0.63% | 616 | 2 | City |
| Villisca | 4 | 1,099 | 1,132 | -0.63% | 616 | 2 | City |
| Stanton | 5 | 663 | 667 | -0.15% | 699 | 1 | City |
| Stanton | 6 | 663 | 667 | -0.15% | 699 | 1 | City |
| Elliott | 7 | 325 | 339 | -0.91% | 767 | 0 | City |
| Elliott | 8 | 325 | 339 | -0.91% | 767 | 0 | City |
| Grant | 9 | 81 | 84 | -1.22% | 110 | 1 | City |
| Grant | 10 | 81 | 84 | -1.22% | 110 | 1 | City |
| Coburg | 11 | 25 | 27 | -3.85% | 87 | 0 | City |
| Coburg | 12 | 25 | 27 | -3.85% | 87 | 0 | City |
Red Oak is the largest city in Montgomery County, with a population of 5,376.
Coburg is the smallest city in Montgomery County, with a population of 25.
There are 12 cities in Montgomery County, Iowa.