| Business | Phone |
| Louisiana Energy & Power Auth 59335 W W Harleaux St, Plaquemine 70764 | (225) 687-9424 |
| Plaquemine City Inspector 23640 Railroad Ave, Plaquemine 70764 | (225) 687-2208 |
| Plaquemine City Light Office 23640 Railroad Ave, Plaquemine 70764 | (225) 687-3725 |
| Plaquemine City Office 24130 Ferdinand St, Plaquemine 70764 | (225) 687-0504 |
| Plaquemine Depot Market 57960 Main St, Plaquemine 70764 | (225) 687-7071 |
| Plaquemine Emergency Medical 57960 Main St, Plaquemine 70764 | (225) 000-1111 |
| Plaquemine Housing Dept 23460 Railroad Ave, Plaquemine 70764 | (225) 687-1942 |
| Plaquemine Light & Water Plant 23640 Railroad Ave, Plaquemine 70764 | (225) 687-6841 |
| Plaquemine Municipal Warehouse 58155 Captain T T Harris St, Plaquemine 70764 | (225) 687-2036 |
| Plaquemine Vehicle Maintenance 58155 Captain T T Harris St, Plaquemine 70764 | (225) 687-4429 |
| Plaquemine Water Plant 58155 Captain T T Harris St, Plaquemine 70764 | (225) 687-2460 |