| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Glenwood | 1 | 5,328 | 5,066 | 0.78% | 1,823 | 3 | City |
| Malvern | 2 | 1,080 | 1,031 | 0.65% | 678 | 2 | City |
| Emerson | 3 | 401 | 398 | 0.25% | 1,573 | 0 | City |
| Silver City | 4 | 247 | 240 | 0.41% | 1,182 | 0 | City |
| Hastings | 5 | 158 | 154 | 0% | 385 | 0 | City |
| Henderson | 6 | 137 | 137 | 0% | 1,030 | 0 | City |
| Pacific Junction | 7 | 100 | 99 | 0% | 132 | 1 | City |
Glenwood is the largest city in Mills County, with a population of 5,328.
Pacific Junction is the smallest city in Mills County, with a population of 100.
There are 7 cities in Mills County, Iowa.