| Business | Phone |
| 911 Center 1200 David Dr, Morgan City 70380 | (985) 385-3385 |
| St Mary Avoca Island Ferry 713 Avoca Rd, Morgan City 70380 | (985) 385-2028 |
| St Mary Civilian Defense Ofc 311 Barrow St, Morgan City 70380 | (985) 385-2600 |
| St Mary Coroner's Office 1125 Marguerite St, Morgan City 70380 | (985) 384-9964 |
| St Mary Narcotics Div 1519 Highway 182 E, Morgan City 70380 | (985) 395-4653 |
| St Mary Sanitation Dept 2717 Highway 182 E, Morgan City 70380 | (985) 395-7816 |
| St Mary Parish Cooperative Ext Morgan City 70380 | (985) 385-2520 |
| St Mary Registrar Of Voters 301 3rd St 6, Morgan City 70380 | (985) 384-8638 |
| St Mary Sub Gravity Drainage 124 Opperman Ln, Morgan City 70380 | (985) 395-2519 |
| St Mary Water District 2 1333 Belleview St, Morgan City 70380 | (985) 395-2747 |