ZIP Code 78521

78521 is one of Texas's ZIP codes, delivering to addresses in Brownsville, Cameron County.

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

Where this code sits

78521 is part of the 785xx range, the group of codes handled by one mail processing centre. Brownsville is served by 5 ZIP codes in total; the full list, with the county each falls in, is on the Brownsville page.

Brownsville Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78521 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78521

The ZIP codes whose reference points sit closest to 78521.
ZIP code	Distance	Delivers to
ZIP code 78522	2.7 mi	Brownsville, TX
ZIP code 78526	3.5 mi	Brownsville, TX
ZIP code 78520	3.6 mi	Brownsville, TX
ZIP code 78523	5.5 mi	Brownsville, TX
ZIP code 78575	9.6 mi	Olmito, TX
ZIP code 78578	13 mi	Port Isabel, TX
ZIP code 78566	14 mi	Los Fresnos, TX
ZIP code 78586	19 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 78521, plotted from its record coordinates.

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

Scope ZIP code 78521. 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.