1604 is the Postal Code/ZIP Code for the of El Rosario in the El Salvador Department of La Paz and the Municipality of El Rosario (La Paz).
| Postal Code | 1604 |
| Postal Code Name | El Rosario |
| Department | La Paz Department |
| Municipality | El Rosario (La Paz) Municipality |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 1606 1618 1622 |