Assumption Parish, Louisiana ZIP codes
7 ZIP codes are in Assumption Parish, plus 2 that cross in from neighboring parishes. It's part of the Baton Rouge, LA metro area.
- ZIP codes
- 7
- Population in these ZIPs
- 38,312
- Avg. median income
- $52,300population-weighted
- Cities & towns
- 7
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Assumption Parish
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 70339 | Pierre Part | 4,848 | $51,659 | $208,400 |
| 70341 | Belle Rose | 3,690 | $35,346 | $88,500 |
| 70372 | Labadieville | 1,968 | $40,659 | $154,200 |
| 70380 | Morgan City | 20,529 | $54,595 | $135,300 |
| 70390 | Napoleonville | 7,160 | $58,667 | $170,400 |
| 70391 | Paincourtville | 0 | — | — |
| 70393 | Plattenville | 117 | $19,256 | $214,900 |
ZIP codes partly in Assumption Parish
These ZIP codes are mostly in a neighboring parish but cover part of Assumption Parish.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 70301 | Thibodaux | Lafourche Parish | 50,095 | $58,394 | $222,700 |
| 70346 | Donaldsonville | Ascension Parish | 9,927 | $35,280 | $180,300 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Assumption Parish
Nearby parishes
Frequently asked questions
How many ZIP codes are in Assumption Parish, Louisiana?
7 ZIP codes are mainly in Assumption Parish, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Assumption Parish?
ZIP codes in Assumption Parish use the city names Belle Rose, Labadieville, Morgan City, Napoleonville, Paincourtville, Pierre Part and Plattenville.
What metro area is Assumption Parish in?
Assumption Parish is part of the Baton Rouge, LA metropolitan statistical area.