ZIP Code 78155

78155 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

78155 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 78155 delivers to without sharing its boundary.

ZIP codes nearest 78155

The ZIP codes whose reference points sit closest to 78155.
ZIP code	Distance	Delivers to
ZIP code 78156	3.5 mi	Seguin, TX
ZIP code 78115	4.8 mi	Geronimo, TX
ZIP code 78123	5.9 mi	Mc Queeney, TX
ZIP code 78638	11 mi	Kingsbury, TX
ZIP code 78124	11 mi	Marion, TX
ZIP code 78150	13 mi	Jbsa Randolph, TX
ZIP code 78130	13 mi	New Braunfels, TX
ZIP code 78131	14 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 78155, plotted from its record coordinates.

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

Scope ZIP code 78155. 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.