| Municipality | ZIP Code |
|---|---|
| San Nicolas | 2901 |
| Location | Municipality | Province | Region | ZIP Code |
|---|---|---|---|---|
| San Silvestre | San Nicolas | Ilocos Norte | Ilocos Region | 2901 |
| Santa Asuncion | San Nicolas | Ilocos Norte | Ilocos Region | 2901 |
| Santa Cecilia | San Nicolas | Ilocos Norte | Ilocos Region | 2901 |
| Santa Monica | San Nicolas | Ilocos Norte | Ilocos Region | 2901 |
