| Districts |
|---|
| Atenas, Atenas |
| Concepción, Atenas |
| Escobal, Atenas |
| Jesús, Atenas |
| Mercedes, Atenas |
| San Isidro, Atenas |
| San José, Atenas |
| Santa Eulalia, Atenas |
| All postal codes in Alajuela |
|---|
| Alajuela |
| Atenas |
| Grecia |
| Guatuso |
| Los Chiles |
| Naranjo |
| Orotina |
| Palmares |
| Poás |
| San Carlos |
| San Mateo |
| San Ramón |
| Upala |
| Valverde Vega |
| Zarcero |