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US ZIP Code Profile

ZIP Code 78648
Luling, Texas

ZIP code 78648 is in Luling, located in Caldwell County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 8,167. The estimated median adjusted gross income per tax return is $42,099, and about 4% of filers report $200,000 or more.

2020 Population
8,167
Census ZCTA
County
Caldwell
FIPS 48055
Median income (est.)
$42,099
IRS SOI 2022
Land Area
145.521 mi²
+ 0.703 mi² water

01Location & Geography

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

Primary CityLuling, TX
CountyCaldwell County (FIPS 48055)
StateTexas (FIPS 48)
Metro Area (MSA)Austin-Round Rock, TX Metro Area (12420)
Census Region / DivisionSouth Region · West South Central Division
Coordinates29.690184, -97.63355
Land / Water Area145.521 mi² land · 0.703 mi² water

02Income & Economics

Distribution of the 3,690 individual tax returns filed in 78648 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
30.3%
$25K–$50K
28.7%
$50K–$75K
16.8%
$75K–$100K
9.2%
$100K–$200K
11.4%
$200K+
3.5%
The $200,000+ bracket accounts for 28% of 78648's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($42,099) 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 78648's IRS income metrics, 2020–2022.

Median income (2021→2022)
$42,099
▲ 7.9%
Filers earning $200K+
3.5%
▲ 0.5 pt
Total filers
3,690
▲ 1.9%
GET /zipc/v2/zipcodes/78648/soi?year=… $36K 2020 $39K 2021 $42K 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 78648 ZCTA.

2000
7,358
 
2010
7,683
▲ +4.4%
2020
8,167
▲ +6.3%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number485415
City AliasesJoliet, Luling, Stairtown

06Frequently Asked Questions

What county is ZIP code 78648 in?

ZIP code 78648 is in Caldwell County, Texas (county FIPS code 48055).

What city is ZIP code 78648?

The primary USPS city for 78648 is Luling, TX.

What metro area (MSA) is 78648 in?

78648 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78648?

The 2020 Census population of 78648 was 8,167 residents.

What is the median income in ZIP code 78648?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78648 is about $42,099, 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.