ZIP CodesZIP codes in St. Mary Parish, Louisiana
St. Mary Parish, Louisiana has 10 ZIP codes in this list, from 70340 to 70540. They cover 9 places, among them Morgan City, Amelia, Berwick and Patterson.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 70340 | Amelia | 0.1 | 29.666, -91.102 |
| 70342 | Berwick | 7.5 | 29.693, -91.252 |
| 70380 | Morgan City | 77.7 | 29.698, -91.265 |
| 70381 | Morgan City | no area | 29.695, -91.259 |
| 70392 | Patterson | 36.8 | 29.697, -91.281 |
| 70514 | Baldwin | 4.6 | 29.849, -91.546 |
| 70522 | Centerville | 0.8 | 29.752, -91.440 |
| 70523 | Charenton | 1.4 | 29.880, -91.534 |
| 70538 | Franklin | 231 | 29.786, -91.503 |
| 70540 | Garden City | no area | 29.763, -91.467 |
The ZIP code areas of St. Mary Parish add up to about 359 square miles of land (931 sq km) as the Census Bureau draws them. The largest is 70538 (Franklin), with 231 square miles.
Places with more than one code here: Morgan City (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Amelia, LA 70340.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.