ZIP Code 78551

78551 is one of Texas's ZIP codes, delivering to addresses in Harlingen, Cameron County.

City: Harlingen
County: Cameron County
State: Texas
Prefix: 785xx

Where this code sits

78551 is part of the 785xx range, the group of codes handled by one mail processing centre. Harlingen is served by 4 ZIP codes in total; the full list, with the county each falls in, is on the Harlingen page.

Harlingen Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78551 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78551

The ZIP codes whose reference points sit closest to 78551.
ZIP code	Distance	Delivers to
ZIP code 78535	1.3 mi	Combes, TX
ZIP code 78550	3.9 mi	Harlingen, TX
ZIP code 78553	4.0 mi	Harlingen, TX
ZIP code 78552	4.6 mi	Harlingen, TX
ZIP code 78593	6.6 mi	Santa Rosa, TX
ZIP code 78559	8.5 mi	La Feria, TX
ZIP code 78594	8.9 mi	Sebastian, TX
ZIP code 78586	9.0 mi	San Benito, TX

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 78551, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 78551. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.