ZIP Code 78115

78115 is one of Texas's ZIP codes, delivering to addresses in Geronimo, Guadalupe County.

City: Geronimo
County: Guadalupe County
State: Texas
Prefix: 781xx

Where this code sits

78115 is part of the 781xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Geronimo.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78115 delivers to without sharing its boundary.

830 Area code 830

ZIP codes nearest 78115

The ZIP codes whose reference points sit closest to 78115.
ZIP code	Distance	Delivers to
ZIP code 78123	4.0 mi	Mc Queeney, TX
ZIP code 78155	4.8 mi	Seguin, TX
ZIP code 78156	6.2 mi	Seguin, TX
ZIP code 78124	6.9 mi	Marion, TX
ZIP code 78108	11 mi	Cibolo, TX
ZIP code 78152	12 mi	Saint Hedwig, TX
ZIP code 78131	12 mi	New Braunfels, TX
ZIP code 78135	12 mi	New Braunfels, 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 78115, plotted from its record coordinates.

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

Scope ZIP code 78115. 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.