ZIP Code 78551 is located in Harlingen Texas. 78551 is entirely within Cameron County. Regionally, it is located in the Brownsville Area.
| ZIP Code Name | Harlingen |
| Primary County | Cameron County |
| ZIP Code Type | PO Box |
| Current Time | CDT |
| Coordinates | 26.19174957,-97.69409943 |
| Adjacent ZIP Codes | |
| Region | Brownsville Area |
| Metropolitan/Micropolitan Stat Area | Brownsville-Harlingen, TX |
| Time Zone | Central Daylight Time |
| IANA Timezone | America/Chicago |