| Place | Post Code |
|---|---|
| Dacudao, San Isidro | 8100 |
| Datu Balong, San Isidro | 8100 |
| Igangon, San Isidro | 8100 |
| Kipalili, San Isidro | 8100 |
| Libuton, San Isidro | 8100 |
| Linao, San Isidro | 8100 |
| Mamangan, San Isidro | 8100 |
| Monte Dujali, San Isidro | 8100 |
| Pinamuno, San Isidro | 8100 |
| Sabangan, San Isidro | 8100 |
| San Miguel, San Isidro | 8100 |
| Santo Niño, San Isidro | 8100 |
| Sawata, San Isidro | 8100 |