30303 is the Postal Code/ZIP Code for the District of San Juan in the Costa Rica Province of Cartago and the Canton of La Unión. The neighborhoods of Araucaria, Herrán, San Juan Viejo and Villas de Ayarco are located in Postal Code 30303.
| Postal Code | 30303 |
| Postal Code Name | San Juan |
| Province | Cartago Province |
| Canton | La Unión Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 11803 11804 30301 30302 30305 30308 |