20303 is the Postal Code/ZIP Code for the District of San José in the Costa Rica Province of Alajuela and the Canton of Grecia. The neighborhoods of Arena, Cedro, Delicias 1, Guayabal, Loma, Rodríguez, Santa Gertrudis Norte and Santa Gertrudis Sur are located in Postal Code 20303.
| Postal Code | 20303 |
| Postal Code Name | San José |
| Province | Alajuela Province |
| Canton | Grecia Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20301 20302 20305 20801 20802 20803 |