- Obstetricians & Gynecologists, Charleston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Charleston
- Occupational Therapy, Charleston - Occupational Health Specialists
- Off Road Vehicles, Charleston
- Off Road Vehicles Parts & Accessories, Charleston
- Office Supplies, Equipment & Office Furniture Stores, Charleston
- Oil & Gas Companies, Charleston
- Oil & Petroleum Products, Charleston - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Charleston - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Charleston - Oil Companies
- Ophthalmologists, Charleston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Charleston - Camera Repair
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Charleston
- Opticians, Charleston
- Optometrists, Charleston - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Charleston
- Ornamental Nursery Services, Charleston
- Orthodontist, Charleston - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Charleston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Charleston
- Outdoor & Lawn & Garden Equipment Repair & Service, Charleston
- Outpatient Services, Charleston - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Charleston - Oxygen Concentrator, Tank, Machine, etc
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