21601 is the Postal Code/ZIP Code for the District of Río Cuarto in the Costa Rica Province of Alajuela and the Canton of Río Cuarto. The neighborhoods of Bolaños, Carrizal, Caño Negro, Crucero, El Carmen, Gosen, La Maravilla, Palmera and Punta Mala are located in Postal Code 21601.
| Postal Code | 21601 |
| Postal Code Name | Río Cuarto |
| Province | Alajuela Province |
| Canton | Río Cuarto Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20114 21005 21203 21602 |