| Ignacio, CO (Town) |
| Ihlen, MN (City) |
| Ila, GA (City) |
| Iliff, CO (Town) |
| Ilion, NY (Village) |
| Illini Township, IL (Township) |
| Illinois, IL (State) |
| Illinois, ND (Township) |
| Illinois, KS (Township) |
| Illinois, KS (Township) |
| Illinois, KS (Township) |
| Illinois, KS (Township) |
| Illiopolis, IL (Village) |
| Illiopolis Township, IL (Township) |
| Illyria Township, IA (Township) |
