12003 is the Postal Code/ZIP Code for the District of Llano Bonito in the Costa Rica Province of San José and the Canton of León Cortés Castro. The neighborhoods of Bajo San Juan, La Concepción, San Francisco, San Luis, San Rafael Abajo and Santa Juana are located in Postal Code 12003.
| Postal Code | 12003 |
| Postal Code Name | Llano Bonito |
| Province | San José Province |
| Canton | León Cortés Castro Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 10503 10605 12002 12004 |