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US ZIP Code Profile

ZIP Code 78121
La Vernia, Texas

ZIP code 78121 is in La Vernia, located in Wilson County, Texas, within the San Antonio-New Braunfels metro area. Its 2020 Census population was 15,206. The estimated median adjusted gross income per tax return is $69,515, and about 11% of filers report $200,000 or more.

2020 Population
15,206
Census ZCTA
County
Wilson
FIPS 48493
Median income (est.)
$69,515
IRS SOI 2022
Land Area
102.895 mi²
+ 0.32 mi² water

01Location & Geography

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

Primary CityLa Vernia, TX
CountyWilson County (FIPS 48493)
StateTexas (FIPS 48)
Metro Area (MSA)San Antonio-New Braunfels, TX Metro Area (41700)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.350286, -98.1073
Land / Water Area102.895 mi² land · 0.32 mi² water

02Income & Economics

Distribution of the 7,470 individual tax returns filed in 78121 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
22.5%
$25K–$50K
17.3%
$50K–$75K
13.1%
$75K–$100K
9.6%
$100K–$200K
26.1%
$200K+
11.4%
The $200,000+ bracket accounts for 40% of 78121's total adjusted gross income, from 11% of returns — a concentration that drives the gap between the median ($69,515) 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 78121's IRS income metrics, 2020–2022.

Median income (2021→2022)
$69,515
▲ 5.8%
Filers earning $200K+
11.4%
▲ 1.9 pt
Total filers
7,470
▲ 2.6%
GET /zipc/v2/zipcodes/78121/soi?year=… $61K 2020 $66K 2021 $70K 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 78121 ZCTA.

2000
7,606
 
2010
11,381
▲ +49.6%
2020
15,206
▲ +33.6%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number484990
City AliasesLa Vernia, Lavernia

06Frequently Asked Questions

What county is ZIP code 78121 in?

ZIP code 78121 is in Wilson County, Texas (county FIPS code 48493).

What city is ZIP code 78121?

The primary USPS city for 78121 is La Vernia, TX.

What metro area (MSA) is 78121 in?

78121 is part of the San Antonio-New Braunfels, TX Metro Area (MSA code 41700).

What is the population of ZIP code 78121?

The 2020 Census population of 78121 was 15,206 residents.

What is the median income in ZIP code 78121?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78121 is about $69,515, with around 11% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.