| Place | Post Code |
|---|---|
| Mabini, Naujan | 5204 |
| Magtibay, Naujan | 5204 |
| Mahabang Parang, Naujan | 5204 |
| Malaya, Naujan | 5204 |
| Malinao, Naujan | 5204 |
| Malvar, Naujan | 5204 |
| Masagana, Naujan | 5204 |
| Masaguing, Naujan | 5204 |
| Melgar A, Naujan | 5204 |
| Melgar B, Naujan | 5204 |
| Metolza, Naujan | 5204 |
| Montelago, Naujan | 5204 |
| Montemayor, Naujan | 5204 |
| Motoderazo, Naujan | 5204 |
| Mulawin, Naujan | 5204 |
| Nag-Iba I, Naujan | 5204 |
| Nag-Iba II, Naujan | 5204 |
| Pagkakaisa, Naujan | 5204 |
| Paitan, Naujan | 5204 |
| Paniquian, Naujan | 5204 |
| Pinagsabangan I, Naujan | 5204 |
| Pinagsabangan II, Naujan | 5204 |
| Piñahan, Naujan | 5204 |
| Poblacion I, Naujan | 5204 |
| Poblacion II, Naujan | 5204 |
| Poblacion III, Naujan | 5204 |