| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Icarid (historical) | city | Iowa | United States | 41.00 | -94.69 | 1249 | |
| Iconium | city | Iowa | United States | 40.89 | -92.96 | 967 | |
| Ida Grove | city | Iowa | United States | 42.34 | -95.47 | 1246 | |
| Illinois Grove | city | Iowa | United States | 42.19 | -93.22 | 1049 | |
| Illyria | city | Iowa | United States | 42.90 | -91.64 | 1174 | |
| Imogene | city | Iowa | United States | 40.88 | -95.43 | 1125 | |
| Independence | city | Iowa | United States | 42.47 | -91.89 | 889 | |
| Indian Ridge Mobile Home Park | city | Iowa | United States | 41.36 | -93.56 | 898 | |
| Indiana | city | Iowa | United States | 41.20 | -93.03 | 905 | |
| Indianapolis | city | Iowa | United States | 41.40 | -92.43 | 830 | |
| Indianola | city | Iowa | United States | 41.36 | -93.56 | 951 | |
| Indianola Junction | city | Iowa | United States | 41.04 | -93.36 | 1023 | |
| Indiantown (historical) | city | Iowa | United States | 41.31 | -95.11 | 1249 | |
| Ingersoll (historical) | city | Iowa | United States | 41.73 | -93.82 | 862 | |
| Inwood | city | Iowa | United States | 43.31 | -96.43 | 1669 | |
| Ioka (historical) | city | Iowa | United States | 41.18 | -92.13 | 839 | |
| Iola (historical) | city | Iowa | United States | 41.33 | -95.38 | 1249 | |
| Ion | city | Iowa | United States | 43.11 | -91.26 | 859 | |
| Ionia | city | Iowa | United States | 43.03 | -92.46 | 1145 | |
| Iowa Center | city | Iowa | United States | 41.93 | -93.41 | 902 | |
| Iowa City | city | Iowa | United States | 41.66 | -91.53 | 830 | |
| Iowa Falls | city | Iowa | United States | 42.52 | -93.25 | 1112 | |
| Iowa Falls Junction | city | Iowa | United States | 42.52 | -93.26 | 1099 | |
| Iowa Junction (historical) | city | Iowa | United States | 41.49 | -91.54 | 830 | |
| Ira | city | Iowa | United States | 41.78 | -93.21 | 902 | |
| Ireton | city | Iowa | United States | 42.97 | -96.32 | 1669 | |
| Ironhills | city | Iowa | United States | 42.14 | -90.77 | 898 | |
| Irving | city | Iowa | United States | 41.95 | -92.30 | 895 | |
| Irvington | city | Iowa | United States | 43.01 | -94.20 | 1141 | |
| Irwin | city | Iowa | United States | 41.79 | -95.21 | 1246 | |
| Ivester | city | Iowa | United States | 42.34 | -92.94 | 1125 | |
| Iveyville | city | Iowa | United States | 40.90 | -94.80 | 1669 | |
| Ivy | city | Iowa | United States | 41.60 | -93.42 | 872 |