12004 is the Postal Code/ZIP Code for the District of San Isidro in the Costa Rica Province of San José and the Canton of León Cortés Castro.
| Postal Code | 12004 |
| Postal Code Name | San Isidro |
| Province | San José Province |
| Canton | León Cortés Castro Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 10502 10503 12001 12002 12003 |