- Occupational Health Care Professionals, Fenton
- Occupational Therapy, Fenton - Occupational Health Specialists
- Off Road Vehicles, Fenton
- Off Road Vehicles Parts & Accessories, Fenton
- Office Supplies, Equipment & Office Furniture Stores, Fenton
- Oil Change & Lubrication, Fenton - Auto Oil & Quick Lube
- Oilfield Trucking, Fenton
- Ophthalmologists, Fenton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fenton
- Opticians, Fenton
- Optometrists, Fenton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Fenton - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Fenton
- Ornamental Nursery, Fenton
- Ornamental Nursery Services, Fenton
- Orthopedic & Prosthetic Appliances & Shoes, Fenton - Orthopedic Shoes
- Other Attorneys & Lawyers, Fenton
- Other Attorneys & Lawyers, Fenton
- Other Building Materials & Supplies, Fenton
- Other Lawyers & Attorneys, Fenton
- Outdoor & Lawn & Garden Equipment Repair & Service, Fenton
- Outdoor Equipment & Accessories, Fenton
- Outdoor Furniture & Patio Furniture, Fenton - Garden Furniture Stores
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