| Place | Postal Code |
|---|---|
| San Agustin, San Nicolas | 2901 |
| San Baltazar, San Nicolas | 2901 |
| San Bartolome, San Nicolas | 2901 |
| San Cayetano, San Nicolas | 2901 |
| San Eugenio, San Nicolas | 2901 |
| San Fernando, San Nicolas | 2901 |
| San Francisco, San Nicolas | 2901 |
| San Gregorio, San Nicolas | 2901 |
| San Guillermo, San Nicolas | 2901 |
| San Ildefonso, San Nicolas | 2901 |
| San Jose, San Nicolas | 2901 |
| San Juan Bautista, San Nicolas | 2901 |
| San Lorenzo, San Nicolas | 2901 |
| San Lucas, San Nicolas | 2901 |
| San Marcos, San Nicolas | 2901 |
| San Miguel, San Nicolas | 2901 |
| San Pablo, San Nicolas | 2901 |
| San Paulo, San Nicolas | 2901 |
| San Pedro, San Nicolas | 2901 |
| San Rufino, San Nicolas | 2901 |
| San Silvestre, San Nicolas | 2901 |
| Santa Asuncion, San Nicolas | 2901 |
| Santa Cecilia, San Nicolas | 2901 |
| Santa Monica, San Nicolas | 2901 |