7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Glenwood | 1 | 5,260 | 5,047 | 0.82% | 1,800 | 2.92 | City |
| Malvern | 2 | 1,062 | 1,034 | 0.57% | 666 | 1.59 | City |
| Emerson | 3 | 401 | 396 | 0.25% | 1,573 | 0.26 | City |
| Silver City | 4 | 249 | 241 | 0.81% | 1,191 | 0.21 | City |
| Hastings | 5 | 158 | 155 | 0.64% | 385 | 0.41 | City |
| Henderson | 6 | 140 | 140 | 0% | 1,053 | 0.13 | City |
| Pacific Junction | 7 | 102 | 99 | 0.99% | 135 | 0.76 | City |
Glenwood is the largest city in Mills County, with a population of 5,260.
Pacific Junction is the smallest city in Mills County.
There are 7 cities in Mills County, Iowa.