Seguin, TX ZIP Codes
Seguin, Texas has 3 ZIP codes: for street addresses and and for PO boxes.
Mail addressed to Seguin covers nearby places too.
Where the 78155 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
78115 and 78156 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Seguin city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Seguin
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Seguin PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 78115 | PO boxes at the Seguin post office Seguin |
| 78155 | street delivery Seguin |
| 78156 | PO boxes at the Seguin post office Seguin |
Why your mail may say Seguin when you live outside it
Seguin ZIP codes also cover Geronimo and New Berlin, so a letter addressed to Seguin can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Guadalupe County property records show which city you are in.
Seguin ZIP code questions
What is the main ZIP code for Seguin?
78155, the ZIP code of the main Seguin post office at 531 W Court St.
Which Seguin ZIP codes are for PO boxes only?
78115 and 78156. Mail to them goes to boxes at the post office, not to street addresses.
What county is Seguin in?
Guadalupe County.
ZIP codes for towns near Seguin
More towns near Seguin: Timberwood Park, San Antonio, Austin, Pflugerville, Cedar Park, Round Rock, Leander, Hutto, Georgetown.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections