| Place | Post Code |
|---|---|
| Abehilan, San Isidro | 6345 |
| Baryong Daan, San Isidro | 6345 |
| Baunos, San Isidro | 6345 |
| Cabanugan, San Isidro | 6345 |
| Caimbang, San Isidro | 6345 |
| Cambansag, San Isidro | 6345 |
| Candungao, San Isidro | 6345 |
| Cansague Norte, San Isidro | 6345 |
| Cansague Sur, San Isidro | 6345 |
| Causwagan Sur, San Isidro | 6345 |
| Masonoy, San Isidro | 6345 |
| Poblacion, San Isidro | 6345 |