Get API Key →
US ZIP Code Profile

ZIP Code 70734
Geismar, Louisiana

ZIP code 70734 is in Geismar, located in Ascension County, Louisiana, within the Baton Rouge metro area. Its 2020 Census population was 8,384. The estimated median adjusted gross income per tax return is $63,988, and about 12% of filers report $200,000 or more.

2020 Population
8,384
Census ZCTA
County
Ascension
FIPS 22005
Median income (est.)
$63,988
IRS SOI 2022
Land Area
27.994 mi²
+ 3.133 mi² water

01Location & Geography

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

Primary CityGeismar, 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
Coordinates30.206556, -90.997
Land / Water Area27.994 mi² land · 3.133 mi² water

02Income & Economics

Distribution of the 3,630 individual tax returns filed in 70734 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
27.0%
$25K–$50K
16.5%
$50K–$75K
11.6%
$75K–$100K
8.8%
$100K–$200K
24.0%
$200K+
12.1%
The $200,000+ bracket accounts for 41% of 70734's total adjusted gross income, from 12% of returns — a concentration that drives the gap between the median ($63,988) 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 70734's IRS income metrics, 2020–2022.

Median income (2021→2022)
$63,988
▲ 5.3%
Filers earning $200K+
12.1%
▲ 2.6 pt
Total filers
3,630
▼ 1.4%
GET /zipc/v2/zipcodes/70734/soi?year=… $56K 2020 $61K 2021 $64K 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 70734 ZCTA.

2000
3,053
 
2010
7,554
▲ +147.4%
2020
8,384
▲ +11.0%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number213393
City AliasesGeismar

06Frequently Asked Questions

What county is ZIP code 70734 in?

ZIP code 70734 is in Ascension County, Louisiana (county FIPS code 22005).

What city is ZIP code 70734?

The primary USPS city for 70734 is Geismar, LA.

What metro area (MSA) is 70734 in?

70734 is part of the Baton Rouge, LA Metro Area (MSA code 12940).

What is the population of ZIP code 70734?

The 2020 Census population of 70734 was 8,384 residents.

What is the median income in ZIP code 70734?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 70734 is about $63,988, with around 12% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.