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US ZIP Code Profile

ZIP Code 78140
Nixon, Texas

ZIP code 78140 is in Nixon, located in Gonzales County, Texas. Its 2020 Census population was 3,607. The estimated median adjusted gross income per tax return is $39,894, and about 2% of filers report $200,000 or more.

2020 Population
3,607
Census ZCTA
County
Gonzales
FIPS 48177
Median income (est.)
$39,894
IRS SOI 2022
Land Area
145.03 mi²
+ 0.583 mi² water

01Location & Geography

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

Primary CityNixon, TX
CountyGonzales County (FIPS 48177)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.333755, -97.7655
Land / Water Area145.03 mi² land · 0.583 mi² water

02Income & Economics

Distribution of the 1,500 individual tax returns filed in 78140 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
31.3%
$25K–$50K
31.3%
$50K–$75K
16.7%
$75K–$100K
8.7%
$100K–$200K
10.0%
$200K+
2.0%
The $200,000+ bracket accounts for 24% of 78140's total adjusted gross income, from 2% of returns — a concentration that drives the gap between the median ($39,894) 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 78140's IRS income metrics, 2020–2022.

Median income (2021→2022)
$39,894
▲ 8.6%
Filers earning $200K+
2.0%
▲ 0.7 pt
Total filers
1,500
▼ 0.7%
GET /zipc/v2/zipcodes/78140/soi?year=… $35K 2020 $37K 2021 $40K 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 78140 ZCTA.

2000
3,386
 
2010
3,380
▼ -0.2%
2020
3,607
▲ +6.7%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number486415
City AliasesNixon

06Frequently Asked Questions

What county is ZIP code 78140 in?

ZIP code 78140 is in Gonzales County, Texas (county FIPS code 48177).

What city is ZIP code 78140?

The primary USPS city for 78140 is Nixon, TX.

What is the population of ZIP code 78140?

The 2020 Census population of 78140 was 3,607 residents.

What is the median income in ZIP code 78140?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78140 is about $39,894, with around 2% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.