| Area | Zip |
|---|---|
| Abulog | 3517 |
| Alcala | 3507 |
| Allacapan | 3523 |
| Amulung | 3505 |
| Aparri | 3515 |
| Baggao | 3506 |
| Ballesteros | 3516 |
| Buguey | 3511 |
| Calayan | 3520 |
| Camalaniugan | 3510 |
| Claveria | 3519 |
| Enrile | 3501 |
| Gattaran | 3508 |
| Gonzaga | 3513 |
| Iguig | 3504 |
| Lal-Lo | 3509 |
| Lasam | 3524 |
| Pamplona | 3522 |
| Peñablanca | 3502 |
| Piat | 3527 |
| Rizal | 3526 |
| Sanchez Mira | 3518 |
| Santa Ana | 3514 |
| Santa Praxedes | 3521 |
| Santa Teresita | 3512 |
| Santo Niño | 3525 |
| Solana | 3503 |
| Tuao | 3528 |
| Tuguegarao | 3500 |