| Place |
Post Code |
| Aguilar, San Isidro |
20106 |
| Alto Pilas, San Isidro |
20106 |
| Buríos, San Isidro |
20106 |
| Carbonal, San Isidro |
20106 |
| Ceiba, San Isidro |
20106 |
| Cerrillal, San Isidro |
20106 |
| Dulce Nombre, San Isidro |
20106 |
| Espino, San Isidro |
20106 |
| Itiquís, San Isidro |
20106 |
| Laguna, San Isidro |
20106 |
| Loría, San Isidro |
20106 |
| Maravilla, San Isidro |
20106 |
| Montaña, San Isidro |
20106 |
| Pilas, San Isidro |
20106 |
| Potrerillos, San Isidro |
20106 |
| San Isidro, San Isidro |
20106 |
| San Jerónimo, San Isidro |
20106 |
| San Rafael, San Isidro |
20106 |
| Tacacorí, San Isidro |
20106 |
| Tuetal Norte, San Isidro |
20106 |
| All postal codes in Alajuela |
| Alajuela, Alajuela |
| Carrizal, Alajuela |
| Desamparados, Alajuela |
| Guácima, Alajuela |
| La Garita, Alajuela |
| Río Segundo, Alajuela |
| Sabanilla, Alajuela |
| San Antonio, Alajuela |
| San Isidro, Alajuela |
| San José, Alajuela |
| San Rafael, Alajuela |
| Sarapiquí, Alajuela |
| Tambor, Alajuela |
| Turrúcares, Alajuela |