UpAlphabetical listing of Places in Cagayan
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ibulo | city | Cagayan | Philippines | 17.95 | 121.77 | 262 | 13768 |
| Ibulu | city | Cagayan | Philippines | 17.95 | 121.77 | 262 | 13768 |
| Ignacio Jurado | city | Cagayan | Philippines | 18.05 | 121.61 | 144 | 20513 |
| Iguican | city | Cagayan | Philippines | 17.86 | 121.55 | 262 | 6700 |
| Iguig | city | Cagayan | Philippines | 17.75 | 121.74 | 272 | 27768 |
| Illuro | city | Cagayan | Philippines | 17.84 | 121.39 | 164 | 7915 |
| Illuru | city | Cagayan | Philippines | 17.84 | 121.39 | 164 | 7915 |
| Imurong | city | Cagayan | Philippines | 17.86 | 121.90 | 242 | 10120 |
| Imurung | city | Cagayan | Philippines | 17.86 | 121.90 | 242 | 10120 |
| Inga | city | Cagayan | Philippines | 17.55 | 121.77 | 118 | 15187 |
| Intal | city | Cagayan | Philippines | 17.95 | 121.98 | 967 | 9238 |
| Inuan | city | Cagayan | Philippines | 18.35 | 121.60 | 13 | 15576 |
| Ipil | city | Cagayan | Philippines | 17.74 | 121.71 | 242 | 34404 |
| Ipil | city | Cagayan | Philippines | 18.31 | 122.04 | 52 | 4298 |
| Iquican | city | Cagayan | Philippines | 17.86 | 121.55 | 262 | 6700 |
| Iraga | city | Cagayan | Philippines | 17.73 | 121.67 | 131 | 44124 |
| Iringan | city | Cagayan | Philippines | 18.18 | 121.59 | 160 | 15208 |
| Isca | city | Cagayan | Philippines | 18.24 | 121.98 | 150 | 7926 |
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