| City | County | 2026 Pop. ↓ |
|---|---|---|
| Iowa City | Johnson County | 76,537 |
| Indianola | Warren County | 17,062 |
| Independence | Buchanan County | 6,356 |
| Iowa Falls | Hardin County | 4,989 |
| Ida Grove | Ida County | 1,964 |
| Inwood | Lyon County | 975 |
| Ireton | Sioux County | 564 |
| Irwin | Shelby County | 314 |
| Ionia | Chickasaw County | 218 |
| Irvington | Humboldt County | 100 |
| Imogene | Fremont County | 36 |