ZIP Code 78578

78578 is one of Texas's ZIP codes, delivering to addresses in Port Isabel, Cameron County.

City: Port Isabel
County: Cameron County
State: Texas
Prefix: 785xx

Where this code sits

78578 is part of the 785xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Port Isabel.

Port Isabel Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78578 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78578

The ZIP codes whose reference points sit closest to 78578.
ZIP code	Distance	Delivers to
ZIP code 78566	7.4 mi	Los Fresnos, TX
ZIP code 78526	11 mi	Brownsville, TX
ZIP code 78521	13 mi	Brownsville, TX
ZIP code 78523	14 mi	Brownsville, TX
ZIP code 78575	15 mi	Olmito, TX
ZIP code 78597	15 mi	South Padre Island, TX
ZIP code 78520	15 mi	Brownsville, TX
ZIP code 78522	16 mi	Brownsville, 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 78578, plotted from its record coordinates.

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

Scope ZIP code 78578. 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.