ZIP Code 78156

78156 is one of Texas's ZIP codes, delivering to addresses in Seguin, Guadalupe County.

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

Where this code sits

78156 is part of the 781xx range, the group of codes handled by one mail processing centre. Seguin is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Seguin page.

Seguin Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78156 delivers to without sharing its boundary.

ZIP codes nearest 78156

The ZIP codes whose reference points sit closest to 78156.
ZIP code	Distance	Delivers to
ZIP code 78155	3.5 mi	Seguin, TX
ZIP code 78123	4.7 mi	Mc Queeney, TX
ZIP code 78115	6.2 mi	Geronimo, TX
ZIP code 78638	9.4 mi	Kingsbury, TX
ZIP code 78130	9.9 mi	New Braunfels, TX
ZIP code 78131	11 mi	New Braunfels, TX
ZIP code 78135	11 mi	New Braunfels, TX
ZIP code 78124	11 mi	Marion, 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 78156, plotted from its record coordinates.

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

Scope ZIP code 78156. 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.