| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Iceboro | city | Maine | United States | 44.11 | -69.78 | 45 | |
| Imnarkuan (historical) | city | Maine | United States | 44.95 | -67.16 | 95 | |
| Indian Landing | city | Maine | United States | 45.21 | -67.87 | 830 | |
| Indian Point | city | Maine | United States | 44.38 | -68.36 | 45 | |
| Indian River | city | Maine | United States | 44.57 | -67.64 | 45 | |
| Ingalls | city | Maine | United States | 43.99 | -70.73 | 905 | |
| Intervale | city | Maine | United States | 43.95 | -70.26 | 98 | |
| Ireland Corner | city | Maine | United States | 43.81 | -70.38 | 298 | |
| Irish Settlement | city | Maine | United States | 45.66 | -67.91 | 830 | |
| Island Falls | city | Maine | United States | 46.01 | -68.27 | 830 | |
| Island Park | city | Maine | United States | 44.32 | -69.89 | 164 | |
| Isle Au Haut | city | Maine | United States | 44.08 | -68.63 | 200 | |
| Islesboro | city | Maine | United States | 44.31 | -68.90 | 32 | |
| Islesford | city | Maine | United States | 44.26 | -68.23 | 0 |