County ZIP codes · Texas · FIPS 48187
Guadalupe County, TX ZIP Codes
Guadalupe County, Texas has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 13 residential and 2 for PO boxes or a single organization. 7 of the residential ones lie mainly in Guadalupe County and 6 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $50,250 in 78140 (Nixon) to $120,048 in 78121 (La Vernia) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Guadalupe County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $57,621 and $100,572.
They carry 13 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 13 residential ZIP codes in Guadalupe County
7 ZIP codes lie mainly in Guadalupe County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 78130 | New Braunfels | 104,009 | 1,143 | $83k | $323k | 56% |
| 78155 | Seguin | 55,600 | 156 | $71k | $267k | 100% |
| 78108 | Cibolo | 49,784 | 1,763 | $113k | $338k | 87% |
| 78124 | Marion | 6,157 | 108 | $74k | $283k | 88% |
| 78638 | Kingsbury | 2,135 | 18 | $69k | $317k | 98% |
| 78123 | McQueeney | 2,127 | 569 | $98k | $239k | 100% |
| 78670 | Staples | 130 | 23 | $79k | $244k | 100% |
Partly in Guadalupe County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 78655 | Martindale | 3,730 | 130 | $56k | $270k | 40% |
| 78154 | Schertz | 41,907 | 1,275 | $101k | $319k | 32% |
| 78121 | La Vernia | 16,120 | 157 | $120k | $403k | 25% |
| 78666 | San Marcos | 88,583 | 461 | $55k | $307k | 16% |
| 78648 | Luling | 7,863 | 59 | $58k | $218k | 15% |
| 78140 | Nixon | 3,474 | 20 | $50k | $85k | 3% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
10 ZIP codes of Guadalupe County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Guadalupe | Elsewhere |
|---|---|---|
| 78130 | 56% | Comal County 43% |
| 78666 | 16% | Hays County 78%; Comal County 4%; Caldwell County 2% |
| 78108 | 87% | Bexar County 10%; Comal County 3% |
| 78154 | 32% | Bexar County 56%; Comal County 12% |
| 78121 | 25% | Wilson County 75% |
| 78648 | 15% | Caldwell County 76%; Gonzales County 9% |
| 78124 | 88% | Bexar County 12% |
| 78655 | 40% | Caldwell County 60% |
| 78140 | 3% | Gonzales County 68%; Wilson County 27%; Karnes County 2% |
| 78638 | 98% | Gonzales County 2% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 78115 | Geronimo |
| 78156 | Seguin |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Guadalupe County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Guadalupe County's ZIP codes use 2 prefixes: 781 and 786.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.