| Place | Post Code |
|---|---|
| San Isidro, Cauayan | 3305 |
| San Luis, Cauayan | 3305 |
| San Pablo, Cauayan | 3305 |
| Santa Luciana, Cauayan | 3305 |
| Santa Maria, Cauayan | 3305 |
| Sillawit, Cauayan | 3305 |
| Sinippil, Cauayan | 3305 |
| Tagaran, Cauayan | 3305 |
| Turayong, Cauayan | 3305 |
| Union, Cauayan | 3305 |
| Villa Concepcion, Cauayan | 3305 |
| Villa Luna, Cauayan | 3305 |
| Villaflor, Cauayan | 3305 |