| Island Lake, MN (Township) |
| Island Park, ID (City) |
| Island Park, NY (Village) |
| Island Park, ND (Township) |
| Islandia , FL (City) |
| Islandia, NY (Village) |
| Islands at Doral (NE) Community Development District, FL (CDD) |
| Islands at Doral (SW) Community Development District, FL (CDD) |
| Islands at Doral III Community Development District, FL (CDD) |
| Islands at Doral Townhomes Community Development District, FL (CDD) |
| Isle, MN (City) |
| Isle Au Haut, ME (Town) |
| Isle Harbor, MN (Township) |
| Isle La Motte, VT (Town) |
| Isle Of Palms, SC (City) |
