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US ZIP Code Profile

ZIP Code 78118
Karnes City, Texas

ZIP code 78118 is in Karnes City, located in Karnes County, Texas. Its 2020 Census population was 4,899. The estimated median adjusted gross income per tax return is $44,643, and about 11% of filers report $200,000 or more.

2020 Population
4,899
Census ZCTA
County
Karnes
FIPS 48255
Median income (est.)
$44,643
IRS SOI 2022
Land Area
181.234 mi²
+ 1.338 mi² water

01Location & Geography

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

Primary CityKarnes City, TX
CountyKarnes County (FIPS 48255)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates28.800642, -98.062935
Land / Water Area181.234 mi² land · 1.338 mi² water

02Income & Economics

Distribution of the 1,890 individual tax returns filed in 78118 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
29.6%
$25K–$50K
25.9%
$50K–$75K
14.8%
$75K–$100K
8.5%
$100K–$200K
10.1%
$200K+
11.1%
The $200,000+ bracket accounts for 72% of 78118's total adjusted gross income, from 11% of returns — a concentration that drives the gap between the median ($44,643) 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 78118's IRS income metrics, 2020–2022.

Median income (2021→2022)
$44,643
▲ 15.1%
Filers earning $200K+
11.1%
▲ 1.5 pt
Total filers
1,890
▲ 1.1%
GET /zipc/v2/zipcodes/78118/soi?year=… $38K 2020 $39K 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 78118 ZCTA.

2000
4,445
 
2010
3,976
▼ -10.6%
2020
4,899
▲ +23.2%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number484565
City AliasesCoy City, Karnes City

06Frequently Asked Questions

What county is ZIP code 78118 in?

ZIP code 78118 is in Karnes County, Texas (county FIPS code 48255).

What city is ZIP code 78118?

The primary USPS city for 78118 is Karnes City, TX.

What is the population of ZIP code 78118?

The 2020 Census population of 78118 was 4,899 residents.

What is the median income in ZIP code 78118?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78118 is about $44,643, 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.