| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Idamaris Gardens | city | Puerto Rico | United States | 18.24 | -66.05 | 200 | |
| Iglesia | city | Puerto Rico | United States | 18.43 | -67.15 | 830 | |
| Iglesia Virgen de la Providencia | city | Puerto Rico | United States | 18.25 | -66.19 | 1797 | |
| Imbery | city | Puerto Rico | United States | 18.44 | -66.55 | 213 | |
| Imbéry Comunidad | city | Puerto Rico | United States | 18.44 | -66.56 | 219 | |
| Imperial Court | city | Puerto Rico | United States | 18.28 | -67.14 | 32 | |
| Indiera Alta | city | Puerto Rico | United States | 18.15 | -66.88 | 2742 | |
| Indios | city | Puerto Rico | United States | 17.99 | -66.82 | 3 | |
| Indios Comunidad | city | Puerto Rico | United States | 17.99 | -66.82 | 13 | |
| Ingenio | city | Puerto Rico | United States | 18.44 | -66.23 | 13 | |
| Ingenio Comunidad | city | Puerto Rico | United States | 18.45 | -66.23 | 13 | |
| Irlanda | city | Puerto Rico | United States | 18.36 | -66.15 | 150 | |
| Irlanda Heights | city | Puerto Rico | United States | 18.35 | -66.15 | 154 | |
| Isabel Josefa | city | Puerto Rico | United States | 18.10 | -67.13 | 45 | |
| Isabel Segunda | city | Puerto Rico | United States | 18.15 | -65.44 | 131 | |
| Isabela | city | Puerto Rico | United States | 18.50 | -67.02 | 200 | |
| Isabela Zona Urbana | city | Puerto Rico | United States | 18.50 | -67.02 | 200 | |
| Isidra | city | Puerto Rico | United States | 18.34 | -65.64 | 6 | |
| Isleta | city | Puerto Rico | United States | 18.37 | -67.11 | 328 | |
| Islote | city | Puerto Rico | United States | 18.49 | -66.60 | 29 | |
| Israel | city | Puerto Rico | United States | 18.42 | -66.04 | 6 | |
| Iturregui | city | Puerto Rico | United States | 18.40 | -66.00 | 104 |