| Place |
Post Code |
| Apayao, Piat |
3527 |
| Aquib, Piat |
3527 |
| Baung, Piat |
3527 |
| Calaoagan, Piat |
3527 |
| Catarauan, Piat |
3527 |
| Dugayung, Piat |
3527 |
| Gumarueng, Piat |
3527 |
| Macapil, Piat |
3527 |
| Maguilling, Piat |
3527 |
| Minanga, Piat |
3527 |
| Poblacion I, Piat |
3527 |
| Poblacion II, Piat |
3527 |
| Santa Barbara, Piat |
3527 |
| Santo Domingo, Piat |
3527 |
| Sicatna, Piat |
3527 |
| Villa Rey, Piat |
3527 |
| Villa Reyno, Piat |
3527 |
| Warat, Piat |
3527 |
| All postal codes in Cagayan |
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| Ballesteros, Cagayan |
| Buguey, Cagayan |
| Calayan, Cagayan |
| Camalaniugan, Cagayan |
| Claveria, Cagayan |
| Enrile, Cagayan |
| Gattaran, Cagayan |
| Gonzaga, Cagayan |
| Iguig, Cagayan |
| Lal-lo, Cagayan |
| Lasam, Cagayan |
| Pamplona, Cagayan |
| Peñablanca, Cagayan |
| Piat, Cagayan |
| Rizal, Cagayan |
| Sanchez-Mira, Cagayan |
| Santa Ana, Cagayan |
| Santa Praxedes, Cagayan |
| Santa Teresita, Cagayan |
| Santo Niño, Cagayan |
| Solana, Cagayan |
| Tuao, Cagayan |
| Tuguegarao, Cagayan |