- Obstetricians & Gynecologists, Marion - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Marion
- Off Road Vehicles Parts & Accessories, Marion
- Office Buildings & Parks, Marion
- Office Supplies, Equipment & Office Furniture Stores, Marion
- Oil Change & Lubrication, Marion - Auto Oil & Quick Lube
- Oncologists, Marion - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Marion - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Marion
- Opticians, Marion
- Optometrists, Marion - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Marion - Dentists - Oral & Maxillofacial Surgeons
- Orchard Equipment, Marion
- Ornamental Greenhouses, Marion
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- Ornamental Nursery, Marion
- Ornamental Nursery Products, Marion
- Ornamental Nursery Services, Marion
- Orthodontist, Marion - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Marion - Orthopedic Shoes
- Orthopedists, Marion - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Marion
- Other Building Materials & Supplies, Marion
- Other Industrial Contractors, Marion
- Outdoor Equipment & Accessories, Marion
- Outpatient Services, Marion - Outpatient Care
- Overhead Door, Marion
- Oxygen & Respiratory Equipment & Supplies, Marion - Oxygen Concentrator, Tank, Machine, etc
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