- Obstetricians & Gynecologists, South Boston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, South Boston
- Oil & Petroleum Products, South Boston - Merchant, Wholesalers, etc
- Oil Change & Lubrication, South Boston - Auto Oil & Quick Lube
- Oncologists, South Boston - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, South Boston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Boston
- Optometrists, South Boston - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, South Boston - Eye Clinics
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- Oral Surgeon, South Boston - Dentists - Oral & Maxillofacial Surgeons
- Orthodontist, South Boston - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, South Boston - Orthopedic Shoes
- Orthopedists, South Boston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, South Boston
- Other Building Materials & Supplies, South Boston
- Outdoor Equipment & Accessories, South Boston
- Oxygen & Respiratory Equipment & Supplies, South Boston - Oxygen Concentrator, Tank, Machine, etc
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