20101 is the Postal Code/ZIP Code for the District of Alajuela in the Costa Rica Province of Alajuela and the Canton of Alajuela. The neighborhoods of Acequia Grande, Aguilar Soto, Bajo Cornizal, Brasil, Canoas, Ciruelas, Copán, Corazón de Jesús, Cristo Rey, El Arroyo, El Carmen, El Llano, El Retiro, Gregorio José Ramírez, Guadalupe, Hospital, La Agonía, La Flory, La Guaria, La Independencia, La Tropicana, Las Mesas, Los Adobes, Los Higuerones, Los Molinos, Los Perfumes, Lotes Prieto, Meza, Montenegro, Murillo, Paso Flores, Providencia, Tomás Guardia and Villa Hermosa are located in Postal Code 20101.
| Postal Code | 20101 |
| Postal Code Name | Alajuela |
| Province | Alajuela Province |
| Canton | Alajuela Canton |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 20102 20103 20104 20106 20109 20110 |