ZIP Code 78604

78604 is one of Texas's ZIP codes, delivering to addresses in Belmont, Gonzales County.

City: Belmont
County: Gonzales County
State: Texas
Prefix: 786xx

Where this code sits

78604 is part of the 786xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Belmont.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78604 delivers to without sharing its boundary.

830 Area code 830

ZIP codes nearest 78604

The ZIP codes whose reference points sit closest to 78604.
ZIP code	Distance	Delivers to
ZIP code 78658	7.5 mi	Ottine, TX
ZIP code 78122	9.8 mi	Leesville, TX
ZIP code 78614	10 mi	Cost, TX
ZIP code 78648	11 mi	Luling, TX
ZIP code 78677	13 mi	Wrightsboro, TX
ZIP code 78638	14 mi	Kingsbury, TX
ZIP code 78629	14 mi	Gonzales, TX
ZIP code 78661	14 mi	Prairie Lea, 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 78604, plotted from its record coordinates.

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

Scope ZIP code 78604. 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.