20603 is the Postal Code/ZIP Code for the District of San José in the Costa Rica Province of Alajuela and the Canton of Naranjo. The neighborhoods of Barranca, Desamparados, San Antonio and Vuelta San Gerardo are located in Postal Code 20603.
| Postal Code | 20603 |
| Postal Code Name | San José |
| Province | Alajuela Province |
| Canton | Naranjo Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20210 20211 20601 20604 20606 21101 21104 |