St. Mary Parish, Louisiana ZIP codes
9 ZIP codes are in St. Mary Parish, plus 2 that cross in from neighboring parishes. It's part of the Morgan City, LA micro area.
- ZIP codes
- 9
- Population in these ZIPs
- 28,129
- Avg. median income
- $52,200population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in St. Mary Parish
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 70340 | Amelia | 0 | — | — |
| 70342 | Berwick | 4,607 | $51,580 | $152,700 |
| 70381 PO Box | Morgan City | — | — | — |
| 70392 | Patterson | 8,173 | $57,959 | $156,600 |
| 70514 | Baldwin | 1,914 | $31,817 | $115,600 |
| 70522 | Centerville | 495 | $26,321 | — |
| 70523 | Charenton | 476 | $63,408 | $120,300 |
| 70538 | Franklin | 12,464 | $52,407 | $104,500 |
| 70540 PO Box | Garden City | — | — | — |
ZIP codes partly in St. Mary Parish
These ZIP codes are mostly in a neighboring parish but cover part of St. Mary Parish.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 70380 | Morgan City | Assumption Parish | 20,529 | $54,595 | $135,300 |
| 70544 | Jeanerette | Iberia Parish | 10,269 | $54,601 | $97,900 |
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 St. Mary Parish
Nearby parishes
Frequently asked questions
How many ZIP codes are in St. Mary Parish, Louisiana?
9 ZIP codes are mainly in St. Mary Parish, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in St. Mary Parish?
ZIP codes in St. Mary Parish use the city names Amelia, Baldwin, Berwick, Centerville, Charenton, Franklin, Garden City, Morgan City and Patterson.
What metro area is St. Mary Parish in?
St. Mary Parish is part of the Morgan City, LA micropolitan statistical area.