- Obstetricians & Gynecologists, Winchester - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Winchester - Occupational Medicine
- Occupational Health Care Professionals, Winchester
- Occupational Medicine Doctors, Winchester - Physicians & Surgeons
- Off Road Vehicles, Winchester
- Off Road Vehicles Parts & Accessories, Winchester
- Office Supplies, Equipment & Office Furniture Stores, Winchester
- Oil & Gas Companies, Winchester
- Oil & Petroleum Products, Winchester - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Winchester - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Winchester - Oil Companies
- Oils Industrial, Winchester
- Ophthalmologists, Winchester - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Winchester
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- Opticians, Winchester
- Optometrists, Winchester - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Winchester - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Winchester
- Ornamental Nursery Products, Winchester
- Ornamental Nursery Services, Winchester
- Orthodontist, Winchester - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Winchester - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Winchester - Physicians & Surgeons
- Other Building Materials & Supplies, Winchester
- Other Lodging, Winchester
- Outdoor & Lawn & Garden Equipment Repair & Service, Winchester
- Outdoor Equipment & Accessories, Winchester
- Overhead Door, Winchester
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