| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Iboy | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.3833333 | 16 | 82684 |
| Ida | city | Province of Ilocos Sur | Philippines | 17 | 120.55 | 688 | 9461 |
| Immayos | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.45 | 82 | 48847 |
| Immayus Norte | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.45 | 82 | 48847 |
| Inandiket | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Indadangan | city | Province of Ilocos Sur | Philippines | 16.9380556 | 120.5822222 | 2805 | 12633 |
| Iteb | city | Province of Ilocos Sur | Philippines | 17.1680556 | 120.6716667 | 1069 | 3745 |
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