- Obstetricians & Gynecologists, Marrero - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Marrero - Occupational Medicine
- Occupational Health Care Professionals, Marrero
- Occupational Therapy, Marrero - Occupational Health Specialists
- Off Road Vehicles, Marrero
- Off Road Vehicles Parts & Accessories, Marrero
- Office Buildings & Parks, Marrero
- Office Supplies, Equipment & Office Furniture Stores, Marrero
- Oil & Gas Producers, Marrero - Companies
- Oil And Petroleum Products, Marrero
- Oil Change & Lubrication, Marrero - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Marrero - Oil Companies
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- Oil Petroleum Wholesale, Marrero
- Ophthalmologists, Marrero - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Marrero
- Opticians, Marrero
- Optometrists, Marrero - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Marrero - Eye Clinics
- Ornamental Nursery, Marrero
- Ornamental Nursery Services, Marrero
- Orthopedic & Prosthetic Appliances & Shoes, Marrero - Orthopedic Shoes
- Orthopedists, Marrero - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Marrero
- Outpatient Services, Marrero - Outpatient Care
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