- Obstetricians & Gynecologists, Winchester - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Winchester
- Occupational Therapy, Winchester - Occupational Health Specialists
- Off Road Vehicles, Winchester
- Off Road Vehicles Parts & Accessories, Winchester
- Office Supplies, Equipment & Office Furniture Stores, 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
- Oil Petroleum Wholesale, Winchester
- Oils & Greases, Winchester
- Oncologists, Winchester - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Winchester - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Winchester - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Winchester
- Opticians, Winchester
- Optometrists, Winchester - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Winchester - Dentists - Oral & Maxillofacial Surgeons
- Oriental Food Products, Winchester
- Oriental Restaurants, Winchester
- Oriental Rugs, Winchester
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- Ornamental Greenhouses, Winchester
- Ornamental Nursery, Winchester
- Ornamental Nursery Products, Winchester
- Ornamental Nursery Services, Winchester
- Orthodontist, Winchester - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Winchester
- Orthopedic & Prosthetic Appliances & Shoes, Winchester - Orthopedic Shoes
- Orthopedists, Winchester - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Winchester
- Other Building Materials & Supplies, Winchester
- Other Electrical Products, Winchester
- Other Lodging, Winchester
- Other Office Supply Stores, Winchester
- Outdoor & Lawn & Garden Equipment Repair & Service, Winchester
- Outdoor Equipment & Accessories, Winchester
- Outdoor Furniture & Patio Furniture, Winchester - Garden Furniture Stores
- Outerwear Stores, Winchester - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Winchester - Care & Treatment Centers
- Outpatient Services, Winchester - Outpatient Care
- Overhead Door, Winchester
- Oxygen & Respiratory Equipment & Supplies, Winchester - Oxygen Concentrator, Tank, Machine, etc
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