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County ZIP codes · Louisiana · FIPS 22005

Ascension Parish, LA ZIP Codes

Ascension Parish, Louisiana has 11 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 7 residential and 4 for PO boxes or a single organization. 2 of the residential ones extend into a neighboring county. Median household income ranges from $82,521 in 70737 (Gonzales) to $128,975 in 70734 (Geismar) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Ascension Parish?

70346 · Donaldsonville: $35k70725 · Darrow: –70734 · Geismar: $129k70737 · Gonzales: $83k70769 · Prairieville: $109k70774 · Saint Amant: $102k70778 · Sorrento: $102k7034670774707697077870737707347072570346 · Donaldsonville: $35k70725 · Darrow: –70734 · Geismar: $129k70737 · Gonzales: $83k70769 · Prairieville: $109k70774 · Saint Amant: $102k70778 · Sorrento: $102k7034670774707697077870737707347072570346 · Donaldsonville: $35k70725 · Darrow: –70734 · Geismar: $129k70737 · Gonzales: $83k70769 · Prairieville: $109k70774 · Saint Amant: $102k70778 · Sorrento: $102k70346707747076970778707377073470725
The residential ZIP codes of Ascension Parish (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $82,521 and $109,404.

They carry 7 postal town names: Prairieville, Gonzales, Saint Amant, Donaldsonville, Geismar, Sorrento, Darrow.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 7 residential ZIP codes in Ascension Parish

Residential ZIP codes mainly in Ascension Parish, largest first; "In this county" is the share of the ZIP's land in the county
In this county
70769 Prairieville 49,278 1,029 $109k $312k 100%
70737 Gonzales 49,084 909 $83k $262k 100%
70774 Saint Amant 10,041 191 $102k $256k 81%
70346 Donaldsonville 9,927 153 $35k $177k 79%
70734 Geismar 9,213 332 $129k $344k 100%
70778 Sorrento 2,742 60 $102k $253k 100%
70725 Darrow 943 110 – $62k 100%

Download the 11 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

2 ZIP codes of Ascension Parish extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Ascension Parish and in the neighboring counties
ZIPIn AscensionElsewhere
7077481%Livingston Parish 19%
7034679%Assumption Parish 21%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Ascension Parish without a residential area (GeoNames postal codes)
ZIPPostal name
70707Gonzales
70718Brittany
70728Duplessis
70738Burnside

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Ascension Parish's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Ascension Parish's ZIP codes use 2 prefixes: 703 and 707.

Three-digit prefixes of Ascension Parish's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Ascension Parish's
PrefixSectional centerHereAll codes
703 New Orleans, LA (SCF 700) 1 38
707 Baton Rouge, LA (SCF 707) 10 67

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.