20104 is the Postal Code/ZIP Code for the District of San Antonio in the Costa Rica Province of Alajuela and the Canton of Alajuela. The neighborhoods of Bajo Monge, Ciruelas, El Roble, El Tejar, La Cañada, La Lucha, Loma Linda, Lotes Murillo, Montecillos, Plywood, Santa Fe, Sánchez and Villa Bonita are located in Postal Code 20104.
| Postal Code | 20104 |
| Postal Code Name | San Antonio |
| Province | Alajuela Province |
| Canton | Alajuela Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20101 20102 20105 20109 20111 20113 |