| Municipality | ZIP Code |
|---|---|
| Santiago | 2707 |
| Location | Municipality | Province | Region | ZIP Code |
|---|---|---|---|---|
| Salincub | Santiago | Ilocos Sur | Ilocos Region | 2707 |
| San Jose | Santiago | Ilocos Sur | Ilocos Region | 2707 |
| San Roque | Santiago | Ilocos Sur | Ilocos Region | 2707 |
| Ubbog | Santiago | Ilocos Sur | Ilocos Region | 2707 |
