- Obstetricians & Gynecologists, Summerville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Summerville
- Office Supplies, Equipment & Office Furniture Stores, Summerville
- Oil & Gas Exploration & Development, Summerville - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Summerville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Summerville - Oil Companies
- Old Age Homes Service, Summerville
- Ophthalmologists, Summerville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Summerville
- Opticians, Summerville
- Optometrists, Summerville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Summerville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Summerville
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- Ornamental Nursery Services, Summerville
- Orthodontist, Summerville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Summerville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Summerville
- Other Attorneys & Lawyers, Summerville
- Other Building Materials & Supplies, Summerville
- Other Lawyers & Attorneys, Summerville
- Outdoor Equipment & Accessories, Summerville
- Outdoor Furniture & Patio Furniture, Summerville - Garden Furniture Stores
- Outpatient Clinics, Summerville - Care & Treatment Centers
- Outpatient Services, Summerville - Outpatient Care
- Ownership Organizations, Summerville
- Oxygen & Respiratory Equipment & Supplies, Summerville - Oxygen Concentrator, Tank, Machine, etc
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