| Lieu | Code postal |
|---|---|
| Amin, Isabela | 6128 |
| Banogbanog, Isabela | 6128 |
| Barangay 1, Isabela | 6128 |
| Barangay 2, Isabela | 6128 |
| Barangay 3, Isabela | 6128 |
| Barangay 4, Isabela | 6128 |
| Barangay 5, Isabela | 6128 |
| Barangay 6, Isabela | 6128 |
| Barangay 7, Isabela | 6128 |
| Barangay 8, Isabela | 6128 |
| Barangay 9, Isabela | 6128 |
| Bulad, Isabela | 6128 |
| Bungahin, Isabela | 6128 |
| Cabcab, Isabela | 6128 |
| Camangcamang, Isabela | 6128 |
| Camp Clark, Isabela | 6128 |
| Cansalongon, Isabela | 6128 |
| Guintubhan, Isabela | 6128 |
| Libas, Isabela | 6128 |
| Limalima, Isabela | 6128 |
| Makilignit, Isabela | 6128 |
| Mansablay, Isabela | 6128 |
| Maytubig, Isabela | 6128 |
| Panaquiao, Isabela | 6128 |
| Riverside, Isabela | 6128 |
| Rumirang, Isabela | 6128 |