21012 is the Postal Code/ZIP Code for the District of Monterrey in the Costa Rica Province of Alajuela and the Canton of San Carlos. The neighborhoods of Alto Cedros, Caño Ciego, Pericos, San Antonio and Santa Marta are located in Postal Code 21012.
| Postal Code | 21012 |
| Postal Code Name | Monterrey |
| Province | Alajuela Province |
| Canton | San Carlos Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 21007 21010 21011 21013 21404 21501 |