ZIP Code 78140

78140 is one of Texas's ZIP codes, delivering to addresses in Nixon, Gonzales County.

City: Nixon
County: Gonzales County
State: Texas
Prefix: 781xx

Where this code sits

78140 is part of the 781xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Nixon.

Nixon Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78140 delivers to without sharing its boundary.

830 Area code 830

ZIP codes nearest 78140

The ZIP codes whose reference points sit closest to 78140.
ZIP code	Distance	Delivers to
ZIP code 78143	5.9 mi	Pandora, TX
ZIP code 78122	6.5 mi	Leesville, TX
ZIP code 78159	8.2 mi	Smiley, TX
ZIP code 78160	12 mi	Stockdale, TX
ZIP code 78677	12 mi	Wrightsboro, TX
ZIP code 78150	13 mi	Jbsa Randolph, TX
ZIP code 78614	15 mi	Cost, TX
ZIP code 78604	16 mi	Belmont, 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 78140, plotted from its record coordinates.

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

Scope ZIP code 78140. 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.