3318 is the Postal Code/ZIP Code for the of San Gerardo in the El Salvador Department of San Miguel and the Municipality of San Gerardo.
| Postal Code | 3318 |
| Postal Code Name | San Gerardo |
| Department | San Miguel Department |
| Municipality | San Gerardo Municipality |
| Timezone | Central Standard Time (CST) |
| Adjacent Postal Codes | 3314 3320 3323 |