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US ZIP Code Profile

ZIP Code 78656
Maxwell, Texas

ZIP code 78656 is in Maxwell, located in Caldwell County, Texas, within the Austin-Round Rock metro area. Its 2020 Census population was 2,596. The estimated median adjusted gross income per tax return is $43,973, and about 2% of filers report $200,000 or more.

2020 Population
2,596
Census ZCTA
County
Caldwell
FIPS 48055
Median income (est.)
$43,973
IRS SOI 2022
Land Area
21.408 mi²
+ 0.118 mi² water

01Location & Geography

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

Primary CityMaxwell, 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
Coordinates29.90451, -97.807304
Land / Water Area21.408 mi² land · 0.118 mi² water

02Income & Economics

Distribution of the 1,890 individual tax returns filed in 78656 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
27.5%
$25K–$50K
29.6%
$50K–$75K
20.6%
$75K–$100K
9.5%
$100K–$200K
11.1%
$200K+
1.6%
The $200,000+ bracket accounts for 14% of 78656's total adjusted gross income, from 2% of returns — a concentration that drives the gap between the median ($43,973) 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 78656's IRS income metrics, 2020–2022.

Median income (2021→2022)
$43,973
▲ 7.2%
Filers earning $200K+
1.6%
▼ 0.5 pt
Total filers
1,890
▲ 32.2%
GET /zipc/v2/zipcodes/78656/soi?year=… $37K 2020 $41K 2021 $44K 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 78656 ZCTA.

2000
2,133
 
2010
2,271
▲ +6.5%
2020
2,596
▲ +14.3%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number485745
City AliasesMaxwell, Reedville

06Frequently Asked Questions

What county is ZIP code 78656 in?

ZIP code 78656 is in Caldwell County, Texas (county FIPS code 48055).

What city is ZIP code 78656?

The primary USPS city for 78656 is Maxwell, TX.

What metro area (MSA) is 78656 in?

78656 is part of the Austin-Round Rock, TX Metro Area (MSA code 12420).

What is the population of ZIP code 78656?

The 2020 Census population of 78656 was 2,596 residents.

What is the median income in ZIP code 78656?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 78656 is about $43,973, 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.