7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Glenwood | 1 | 5,295 | 5,070 | 0.86% | 1,811 | 3 | City |
| Malvern | 2 | 1,062 | 1,032 | 0.57% | 666 | 2 | City |
| Emerson | 3 | 401 | 398 | 0% | 1,573 | 0 | City |
| Silver City | 4 | 245 | 239 | 0.41% | 1,172 | 0 | City |
| Hastings | 5 | 157 | 155 | 0% | 383 | 0 | City |
| Henderson | 6 | 140 | 140 | 0% | 1,053 | 0 | City |
| Pacific Junction | 7 | 99 | 98 | 0% | 131 | 1 | City |
Glenwood is the largest city in Mills County, with a population of 5,295.
Pacific Junction is the smallest city in Mills County, with a population of 99.
There are 7 cities in Mills County, Iowa.