| Place | Post Code |
|---|---|
| Bretania, San Agustin | 8305 |
| Buatong, San Agustin | 8305 |
| Buhisan, San Agustin | 8305 |
| Gata, San Agustin | 8305 |
| Hornasan, San Agustin | 8305 |
| Janipaan, San Agustin | 8305 |
| Kauswagan, San Agustin | 8305 |
| Oteiza, San Agustin | 8305 |
| Poblacion, San Agustin | 8305 |
| Pong-On, San Agustin | 8305 |
| Pongtod, San Agustin | 8305 |
| Salvacion, San Agustin | 8305 |
| Santo Niño, San Agustin | 8305 |