| Place | Post Code |
|---|---|
| Santa Barbara, Ilagan | 3300 |
| Santa Catalina, Ilagan | 3300 |
| Santa Isabel Norte, Ilagan | 3300 |
| Santa Isabel Sur, Ilagan | 3300 |
| Santa Maria, Ilagan | 3300 |
| Santa Victoria, Ilagan | 3300 |
| Santo Tomas, Ilagan | 3300 |
| Siffu, Ilagan | 3300 |
| Sindon Bayabo, Ilagan | 3300 |
| Sindon Maride, Ilagan | 3300 |
| Sipay, Ilagan | 3300 |
| Tangcul, Ilagan | 3300 |
| Villa Imelda, Ilagan | 3300 |