| City: | Harlingen, Texas |
| County: | Cameron County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 9:22:49 PM |
| Population: | No Population Data |
| Area Code: | 956 |
| Classification: | PO Box |
| Coordinates: | 26.1906, -97.6956 |
| Quick Link: |
78551 isn't a residential ZIP code. It's a point-only postal designation serving a downtown Harlingen post office facility. The ZIP has no geographic territory of its own and sits within the boundaries of ZIP 78550. Census data shows zero population because no one lives within this postal boundary.
The post office maintains 255 PO Boxes and serves 193 business delivery points. All street delivery goes to a single address on E Van Buren Avenue, which has 147 ZIP+4 records with unit designators. This pattern suggests a multi-tenant commercial building or office complex.
Harlingen is in Cameron County in the Rio Grande Valley, approximately 30 miles from the Mexican border. This isn't a PO Box Only Zone. Street delivery is available through neighboring ZIP codes, so 78551 serves those who specifically want a downtown PO Box address.
Mail can be addressed to PO Boxes or to units at the E Van Buren Avenue address. Businesses operating in this ZIP benefit from a central Harlingen location without needing a dedicated street address.
All street delivery funnels to one address with multiple units, typical of a commercial building or office complex.
ZIP Code 78551 supports both business and residential activity. According to the Business Census (2024), there are 30 business establishments, employing about 1,178 people with an annual payroll of $55,710,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 3,000Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 30Source: CBP |
| 1st Quarter Payroll: | $12,856,000Source: CBP |
| Annual Payroll: | $55,710,000Source: CBP |
| # of Employees: | 1,178Source: CBP |
ZIP Code 78551 is located in Cameron County, Texas, within the Brownsville-Harlingen, TX Metropolitan Statistical Area (CBSA 15180) and Texas's 34th Congressional District. This Metro area has a population of 423,192 people, about 0.00% of whom live in ZIP Code 78551. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Brownsville-Harlingen, TXSource: Census |
| CBSA Number: | 15180Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 423,192Source: Census |
| MSA: | Brownsville-Harlingen-San Benito, TX MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 34Source: USPS |
| Congressional Land Area: | 8190.32 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4832372Source: Census |
| Place Name: | Harlingen city; TexasSource: Census |
We could not locate which school district 78551 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.