21003 is the Postal Code/ZIP Code for the District of Buenavista in the Costa Rica Province of Alajuela and the Canton of San Carlos. The neighborhoods of Culebra, Quina, San Antonio and San Bosco are located in Postal Code 21003.
| Postal Code | 21003 |
| Postal Code Name | Buenavista |
| Province | Alajuela Province |
| Canton | San Carlos Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20214 21001 21002 21102 21106 |