| Place | Post Code |
|---|---|
| Anonang, San Guillermo | 3308 |
| Aringay, San Guillermo | 3308 |
| Burgos, San Guillermo | 3308 |
| Calaoagan, San Guillermo | 3308 |
| Centro 1, San Guillermo | 3308 |
| Centro 2, San Guillermo | 3308 |
| Colorado, San Guillermo | 3308 |
| Dietban, San Guillermo | 3308 |
| Dingading, San Guillermo | 3308 |
| Dipacamo, San Guillermo | 3308 |
| Estrella, San Guillermo | 3308 |
| Guam, San Guillermo | 3308 |
| Nakar, San Guillermo | 3308 |
| Palawan, San Guillermo | 3308 |
| Progreso, San Guillermo | 3308 |
| Rizal, San Guillermo | 3308 |
| San Francisco Norte, San Guillermo | 3308 |
| San Francisco Sur, San Guillermo | 3308 |
| San Mariano Norte, San Guillermo | 3308 |
| San Mariano Sur, San Guillermo | 3308 |
| San Rafael, San Guillermo | 3308 |
| Sinalugan, San Guillermo | 3308 |
| Villa Remedios, San Guillermo | 3308 |
| Villa Rose, San Guillermo | 3308 |
| Villa Sanchez, San Guillermo | 3308 |
| Villa Teresita, San Guillermo | 3308 |