| Postal Code | Postal Code Place Name | Province | Canton |
|---|---|---|---|
| 21301 | Upala | Alajuela | Upala |
| 21302 | Aguas Claras | Alajuela | Upala |
| 21303 | San José o Pizote | Alajuela | Upala |
| 21304 | Bijagua | Alajuela | Upala |
| 21305 | Delicias | Alajuela | Upala |
| 21306 | Dos Ríos | Alajuela | Upala |
| 21307 | Yolillal | Alajuela | Upala |
| 21308 | Canalete | Alajuela | Upala |