20106 is the Postal Code/ZIP Code for the District of San Isidro in the Costa Rica Province of Alajuela and the Canton of Alajuela. The neighborhoods of Alto Pilas, Buríos, Carbonal, Cerrillal, Concordia, Dulce Nombre, El Rodeo, Imas 1, Imas 2, Itiquís, La Ceiba, La Laguna, Loría, Montaña, Pilas, Potrerillos, San Jerónimo, San Martín and Tacacorí are located in Postal Code 20106.
| Postal Code | 20106 |
| Postal Code Name | San Isidro |
| Province | Alajuela Province |
| Canton | Alajuela Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20101 20102 20103 20107 20112 40105 40405 |