ZIP Code 78598

78598 is one of Texas's ZIP codes, delivering to addresses in Port Mansfield, Willacy County.

City: Port Mansfield
County: Willacy County
State: Texas
Prefix: 785xx

Where this code sits

78598 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 Mansfield.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78598 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78598

The ZIP codes whose reference points sit closest to 78598.
ZIP code	Distance	Delivers to
ZIP code 78590	14 mi	San Perlita, TX
ZIP code 78583	24 mi	Rio Hondo, TX
ZIP code 78580	24 mi	Raymondville, TX
ZIP code 78569	24 mi	Lyford, TX
ZIP code 78597	26 mi	South Padre Island, TX
ZIP code 78568	26 mi	Lozano, TX
ZIP code 78594	28 mi	Sebastian, TX
ZIP code 78551	28 mi	Harlingen, 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 78598, plotted from its record coordinates.

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

Scope ZIP code 78598. 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.