3423 is the Postal Code/ZIP Code for the of Santa María in the El Salvador Department of Usulután and the Municipality of Santa María.
| Postal Code | 3423 |
| Postal Code Name | Santa María |
| Department | Usulután Department |
| Municipality | Santa María Municipality |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 3401 3407 3422 |