11 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Iowa City | Johnson County | 77,159 |
| Indianola | Warren County | 16,405 |
| Independence | Buchanan County | 6,311 |
| Iowa Falls | Hardin County | 4,968 |
| Ida Grove | Ida County | 1,969 |
| Inwood | Lyon County | 971 |
| Ireton | Sioux County | 568 |
| Irwin | Shelby County | 320 |
| Ionia | Chickasaw County | 218 |
| Irvington | Humboldt County | 68 |
| Imogene | Fremont County | 36 |