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US ZIP Code Profile

ZIP Code 70737
Gonzales, Louisiana

ZIP code 70737 is in Gonzales, located in Ascension County, Louisiana, within the Baton Rouge metro area. Its 2020 Census population was 47,332. The estimated median adjusted gross income per tax return is $49,838, and about 6% of filers report $200,000 or more.

2020 Population
47,332
Census ZCTA
County
Ascension
FIPS 22005
Median income (est.)
$49,838
IRS SOI 2022
Land Area
53.869 mi²
+ 0.324 mi² water

01Location & Geography

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

Primary CityGonzales, LA
CountyAscension County (FIPS 22005)
StateLouisiana (FIPS 22)
Metro Area (MSA)Baton Rouge, LA Metro Area (12940)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.22238, -90.922195
Land / Water Area53.869 mi² land · 0.324 mi² water

02Income & Economics

Distribution of the 21,380 individual tax returns filed in 70737 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
28.4%
$25K–$50K
21.7%
$50K–$75K
14.3%
$75K–$100K
10.0%
$100K–$200K
19.8%
$200K+
5.8%
The $200,000+ bracket accounts for 28% of 70737's total adjusted gross income, from 6% of returns — a concentration that drives the gap between the median ($49,838) 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 70737's IRS income metrics, 2020–2022.

Median income (2021→2022)
$49,838
▲ 5.1%
Filers earning $200K+
5.8%
▲ 0.6 pt
Total filers
21,380
▲ 1.1%
GET /zipc/v2/zipcodes/70737/soi?year=… $45K 2020 $47K 2021 $50K 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 70737 ZCTA.

2000
28,474
 
2010
38,643
▲ +35.7%
2020
47,332
▲ +22.5%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number213588
City AliasesGonzales

06Frequently Asked Questions

What county is ZIP code 70737 in?

ZIP code 70737 is in Ascension County, Louisiana (county FIPS code 22005).

What city is ZIP code 70737?

The primary USPS city for 70737 is Gonzales, LA.

What metro area (MSA) is 70737 in?

70737 is part of the Baton Rouge, LA Metro Area (MSA code 12940).

What is the population of ZIP code 70737?

The 2020 Census population of 70737 was 47,332 residents.

What is the median income in ZIP code 70737?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 70737 is about $49,838, with around 6% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.