- Obstetricians, Winchester - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Winchester - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Winchester
- Occupational Therapy, Winchester - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Winchester
- Oil Industry & Oil Field Equipment & Services, Winchester - Oil Companies
- Oil Petroleum Wholesale, Winchester
- Oncologists, Winchester - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Winchester - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Winchester
- Optometrists, Winchester - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Winchester
- Ornamental Nursery Services, Winchester
- Orthodontist, Winchester - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Winchester - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Winchester
- Outdoor & Lawn & Garden Equipment Repair & Service, Winchester
- Outdoor Equipment & Accessories, Winchester
- Outerwear & Accessories Manufacturers, Winchester
- Outpatient Services, Winchester - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Winchester - Oxygen Concentrator, Tank, Machine, etc
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