21306 is the Postal Code/ZIP Code for the District of Dos Ríos in the Costa Rica Province of Alajuela and the Canton of Upala. The neighborhoods of Argelia, Jabalina, La Colonia, Manzanal, Petrona Cárcamo, San Cristóbal and San Luis are located in Postal Code 21306.
| Postal Code | 21306 |
| Postal Code Name | Dos Ríos |
| Province | Alajuela Province |
| Canton | Upala Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 21302 21303 50102 50103 51002 |