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County ZIP codes · Louisiana · FIPS 22007

Assumption Parish, LA ZIP Codes

Assumption Parish, Louisiana has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Assumption Parish and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $40,659 in 70372 (Labadieville) to $58,667 in 70390 (Napoleonville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Assumption Parish?

70301 · Thibodaux: $58k70339 · Pierre Part: $52k70341 · Belle Rose: $35k70346 · Donaldsonville: $35k70372 · Labadieville: $41k70380 · Morgan City: $55k70390 · Napoleonville: $59k70391 · Paincourtville: –70393 · Plattenville: $19k703017039070380703397034670341703727039370301 · Thibodaux: $58k70339 · Pierre Part: $52k70341 · Belle Rose: $35k70346 · Donaldsonville: $35k70372 · Labadieville: $41k70380 · Morgan City: $55k70390 · Napoleonville: $59k70391 · Paincourtville: –70393 · Plattenville: $19k7030170390703807033970346703417037270301 · Thibodaux: $58k70339 · Pierre Part: $52k70341 · Belle Rose: $35k70346 · Donaldsonville: $35k70372 · Labadieville: $41k70380 · Morgan City: $55k70390 · Napoleonville: $59k70391 · Paincourtville: –70393 · Plattenville: $19k70301703907038070339703467034170372
The residential ZIP codes of Assumption 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 $40,659 and $58,394.

They carry 9 postal town names.

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

All 9 residential ZIP codes in Assumption Parish

7 ZIP codes lie mainly in Assumption Parish; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Assumption Parish, largest first; "In this county" is the share of the ZIP's land in the county
In this county
70380 Morgan City 20,529 264 $55k $142k 39%
70390 Napoleonville 7,160 48 $59k $163k 100%
70339 Pierre Part 4,848 88 $52k $171k 87%
70341 Belle Rose 3,690 82 $35k $89k 100%
70372 Labadieville 1,968 68 $41k $105k 100%
70393 Plattenville 117 21 $19k $215k 100%
70391 Paincourtville no residents 0 – – 100%

Partly in Assumption Parish

Residential ZIP codes mainly in another county that reach at least 1% into Assumption Parish, by their share here
In this county
70346 Donaldsonville 9,927 153 $35k $177k 21%
70301 Thibodaux 50,095 177 $58k $218k 2%

Download the 9 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?

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

Share of each ZIP code's land in Assumption Parish and in the neighboring counties
ZIPIn AssumptionElsewhere
703012%Lafourche Parish97%
7038039%St. Mary Parish32%; St. Martin Parish29%
7034621%Ascension Parish79%
7033987%St. Martin Parish13%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Assumption Parish starts with 703.

Three-digit prefixes of Assumption 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 Assumption Parish's
PrefixSectional centerHereAll codes
703New Orleans, LA (SCF 700)938

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