20203 is the Postal Code/ZIP Code for the District of San Juan in the Costa Rica Province of Alajuela and the Canton of San Ramón. The neighborhoods of Bajo Tajos, Belén, El Llamarón, Hospital, INVU Vicente Badilla, Juntas, Los Laureles, Pueblo Nuevo and Tejar are located in Postal Code 20203.
| Postal Code | 20203 |
| Postal Code Name | San Juan |
| Province | Alajuela Province |
| Canton | San Ramón Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20201 20204 20207 20208 20210 20211 |