20503 is the Postal Code/ZIP Code for the District of Mercedes in the Costa Rica Province of Alajuela and the Canton of Atenas. The neighborhoods of Callao, El Plancillo, Fátima, La Guaria and Plazoleta are located in Postal Code 20503.
| Postal Code | 20503 |
| Postal Code Name | Mercedes |
| Province | Alajuela Province |
| Canton | Atenas Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20501 20502 20504 20506 20507 |