| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ibulu | city | Province of Cagayan | Philippines | 17.95 | 121.7666667 | 262 | 15655 |
| Iguican | city | Province of Cagayan | Philippines | 17.8619444 | 121.5486111 | 262 | 7582 |
| Iguig | city | Province of Cagayan | Philippines | 17.7527778 | 121.7383333 | 265 | 30566 |
| Illuru | city | Province of Cagayan | Philippines | 17.8352778 | 121.3930556 | 164 | 6757 |
| Imurung | city | Province of Cagayan | Philippines | 17.9261111 | 121.9261111 | 311 | 9934 |
| Inga | city | Province of Cagayan | Philippines | 17.5486111 | 121.7658333 | 118 | 47629 |
| Intal | city | Province of Cagayan | Philippines | 17.95 | 121.9833333 | 967 | 9934 |
| Inuan | city | Province of Cagayan | Philippines | 18.35 | 121.6 | 13 | 16347 |
| Ipil | city | Province of Cagayan | Philippines | 17.7436111 | 121.7136111 | 242 | 38097 |
| Ipil | city | Province of Cagayan | Philippines | 18.3144444 | 122.0455556 | 52 | 5261 |
| Iquican | city | Province of Cagayan | Philippines | 17.8619444 | 121.5486111 | 262 | 7582 |
| Iraga | city | Province of Cagayan | Philippines | 17.7016667 | 121.6547222 | 154 | 58083 |
| Iraga | city | Province of Cagayan | Philippines | 17.7269444 | 121.6694444 | 131 | 47098 |
| Isca | city | Province of Cagayan | Philippines | 18.2383333 | 121.9775 | 154 | 9233 |
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