ZIP Code 78594

78594 is one of Texas's ZIP codes, delivering to addresses in Sebastian, Willacy County.

City: Sebastian
County: Willacy County
State: Texas
Prefix: 785xx

Where this code sits

78594 is part of the 785xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Sebastian.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78594 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78594

The ZIP codes whose reference points sit closest to 78594.
ZIP code	Distance	Delivers to
ZIP code 78569	4.9 mi	Lyford, TX
ZIP code 78593	6.2 mi	Santa Rosa, TX
ZIP code 78562	7.6 mi	La Villa, TX
ZIP code 78535	8.1 mi	Combes, TX
ZIP code 78551	8.9 mi	Harlingen, TX
ZIP code 78538	9.3 mi	Edcouch, TX
ZIP code 78580	9.4 mi	Raymondville, TX
ZIP code 78561	10 mi	Lasara, 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 78594, plotted from its record coordinates.

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

Scope ZIP code 78594. 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.