3120 is the Postal Code/ZIP Code for the of San José in the El Salvador Department of La Unión and the Municipality of San José.
| Postal Code | 3120 |
| Postal Code Name | San José |
| Department | La Unión Department |
| Municipality | San José Municipality |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 3105 3116 3119 3121 |