St. Mary Parish ZIP Codes
St. Mary Parish is a parish of Louisiana.
- ZIP codes
- 10
- Cities & towns
- 9
- Area codes
- 2
- Land area
- 559 sq mi
Every ZIP code in St. Mary Parish
| ZIP code | City |
|---|---|
| 70340 | Amelia |
| 70342 | Berwick |
| 70380 | Morgan City |
| 70381 | Morgan City |
| 70392 | Patterson |
| 70514 | Baldwin |
| 70522 | Centerville |
| 70523 | Charenton |
| 70538 | Franklin |
| 70540 | Garden City |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the St. Mary Parish codes above are listed without a column we would have to invent.
Cities and towns in St. Mary Parish
A further 4 places in St. Mary Parish appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering St. Mary Parish
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the parish without matching its edges.
Where St. Mary Parish's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in St. Mary Parish. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.