- Obstetricians & Gynecologists, Oak Ridge - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Oak Ridge
- Occupational Therapy, Oak Ridge - Occupational Health Specialists
- Office Buildings & Parks, Oak Ridge
- Office Supplies, Equipment & Office Furniture Stores, Oak Ridge
- Oil & Petroleum Products, Oak Ridge - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Oak Ridge - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Oak Ridge - Oil Companies
- Old Age Homes Service, Oak Ridge
- Oncologists, Oak Ridge - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Oak Ridge - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Oak Ridge - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oak Ridge
- Opticians, Oak Ridge
- Optometrists, Oak Ridge - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Oak Ridge - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Oak Ridge
- Ornamental Nursery, Oak Ridge
- Ornamental Nursery Services, Oak Ridge
- Orthodontist, Oak Ridge - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Oak Ridge
- Orthopedic & Prosthetic Appliances & Shoes, Oak Ridge - Orthopedic Shoes
- Orthopedists, Oak Ridge - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Oak Ridge - Physicians & Surgeons
- Other Building Materials & Supplies, Oak Ridge
- Outdoor Equipment & Accessories, Oak Ridge
- Outdoor Furniture & Patio Furniture, Oak Ridge - Garden Furniture Stores
- Outpatient Clinics, Oak Ridge - Care & Treatment Centers
- Outpatient Services, Oak Ridge - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Oak Ridge - Oxygen Concentrator, Tank, Machine, etc
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