| Irion County, TX (County) |
| Irishtown Township, IL (Township) |
| Irmo, SC (Town) |
| Iron City, TN (Town) |
| Iron City, GA (Town) |
| Iron County, MO (County) |
| Iron County, UT (County) |
| Iron County, WI (County) |
| Iron County, MI (County) |
| Iron Gate, VA (Town) |
| Iron Junction, MN (City) |
| Iron Mountain, MI (City) |
| Iron Mountain Lake, MO (City) |
| Iron Range, MN (Township) |
| Iron Ridge Village, WI (Village) |
