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US ZIP Code Profile

ZIP Code 78159
Smiley, Texas

ZIP code 78159 is in Smiley, located in Gonzales County, Texas. Its 2020 Census population was 793. The estimated median adjusted gross income per tax return is $41,071, and about 5% of filers report $200,000 or more.

2020 Population
793
Census ZCTA
County
Gonzales
FIPS 48177
Median income (est.)
$41,071
IRS SOI 2022
Land Area
155.219 mi²
+ 0.183 mi² water

01Location & Geography

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

Primary CitySmiley, TX
CountyGonzales County (FIPS 48177)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.231773, -97.590675
Land / Water Area155.219 mi² land · 0.183 mi² water

02Income & Economics

Distribution of the 420 individual tax returns filed in 78159 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
28.6%
$25K–$50K
33.3%
$50K–$75K
14.3%
$75K–$100K
7.1%
$100K–$200K
11.9%
$200K+
4.8%
The $200,000+ bracket accounts for 54% of 78159's total adjusted gross income, from 5% of returns — a concentration that drives the gap between the median ($41,071) 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 78159's IRS income metrics, 2020–2022.

Median income (2021→2022)
$41,071
▲ 12.4%
Filers earning $200K+
4.8%
▼ 0.2 pt
Total filers
420
▲ 5.0%
GET /zipc/v2/zipcodes/78159/soi?year=… $37K 2020 $37K 2021 $41K 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 78159 ZCTA.

2000
964
 
2010
1,023
▲ +6.1%
2020
793
▼ -22.5%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number488430
City AliasesSmiley

06Frequently Asked Questions

What county is ZIP code 78159 in?

ZIP code 78159 is in Gonzales County, Texas (county FIPS code 48177).

What city is ZIP code 78159?

The primary USPS city for 78159 is Smiley, TX.

What is the population of ZIP code 78159?

The 2020 Census population of 78159 was 793 residents.

What is the median income in ZIP code 78159?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78159 is about $41,071, with around 5% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.