11 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Iowa City | Johnson County | 76,186 |
| Indianola | Warren County | 16,164 |
| Independence | Buchanan County | 6,254 |
| Iowa Falls | Hardin County | 4,945 |
| Ida Grove | Ida County | 1,944 |
| Inwood | Lyon County | 977 |
| Ireton | Sioux County | 572 |
| Irwin | Shelby County | 318 |
| Ionia | Chickasaw County | 213 |
| Irvington | Humboldt County | 68 |
| Imogene | Fremont County | 37 |