| Postal Code | Postal Code Place Name | Province | Canton |
|---|---|---|---|
| 20601 | Naranjo | Alajuela | Naranjo |
| 20602 | San Miguel | Alajuela | Naranjo |
| 20603 | San José | Alajuela | Naranjo |
| 20604 | Cirrí Sur | Alajuela | Naranjo |
| 20605 | San Jerónimo | Alajuela | Naranjo |
| 20606 | San Juan | Alajuela | Naranjo |
| 20607 | El Rosario | Alajuela | Naranjo |
| 20608 | Palmitos | Alajuela | Naranjo |