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US ZIP Code Profile

ZIP Code 78155
Seguin, Texas

ZIP code 78155 is in Seguin, located in Guadalupe County, Texas, within the San Antonio-New Braunfels metro area. Its 2020 Census population was 51,772. The estimated median adjusted gross income per tax return is $45,469, and about 4% of filers report $200,000 or more.

2020 Population
51,772
Census ZCTA
County
Guadalupe
FIPS 48187
Median income (est.)
$45,469
IRS SOI 2022
Land Area
354.429 mi²
+ 1.53 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CitySeguin, TX
CountyGuadalupe County (FIPS 48187)
StateTexas (FIPS 48)
Metro Area (MSA)San Antonio-New Braunfels, TX Metro Area (41700)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.542969, -97.9377
Land / Water Area354.429 mi² land · 1.53 mi² water

02Income & Economics

Distribution of the 26,050 individual tax returns filed in 78155 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
27.7%
$25K–$50K
27.2%
$50K–$75K
16.3%
$75K–$100K
9.8%
$100K–$200K
14.9%
$200K+
4.0%
The $200,000+ bracket accounts for 26% of 78155's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($45,469) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 78155's IRS income metrics, 2020–2022.

Median income (2021→2022)
$45,469
▲ 8.1%
Filers earning $200K+
4.0%
▲ 0.2 pt
Total filers
26,050
▲ 5.4%
GET /zipc/v2/zipcodes/78155/soi?year=… $39K 2020 $42K 2021 $45K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 78155 ZCTA.

2000
39,843
 
2010
45,341
▲ +13.8%
2020
51,772
▲ +14.2%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number488235
City AliasesSeguin, New Berlin

06Frequently Asked Questions

What county is ZIP code 78155 in?

ZIP code 78155 is in Guadalupe County, Texas (county FIPS code 48187).

What city is ZIP code 78155?

The primary USPS city for 78155 is Seguin, TX.

What metro area (MSA) is 78155 in?

78155 is part of the San Antonio-New Braunfels, TX Metro Area (MSA code 41700).

What is the population of ZIP code 78155?

The 2020 Census population of 78155 was 51,772 residents.

What is the median income in ZIP code 78155?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78155 is about $45,469, with around 4% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.