- Obstetricians & Gynecologists, Charleston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Charleston - Occupational Medicine
- Occupational Health Care Professionals, Charleston
- Occupational Therapy, Charleston - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Charleston
- Office Buildings & Parks, Charleston
- Office Furniture & Equipment Rental & Leasing, Charleston
- Office Supplies, Equipment & Office Furniture Stores, Charleston
- Office Systems Designer & Consultants, Charleston
- Oil & Gas Companies, Charleston
- Oil & Gas Exploration & Development, Charleston - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Charleston
- Oil & Gas Producers, Charleston - Companies
- Oil & Gas Well Drilling Services, Charleston
- Oil & Petroleum Products, Charleston - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Charleston - Auto Oil & Quick Lube
- Oil Field Installation, Charleston
- Oil Industry & Oil Field Equipment & Services, Charleston - Oil Companies
- Oil Petroleum Wholesale, Charleston
- Oil Well Equipment & Supplies, Charleston
- Oil Well Logging & Perforating, Charleston
- Old Age Homes Service, Charleston
- Oncologists, Charleston - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Charleston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opinion Analysis & Research, Charleston
- Optical Goods Manufacturers, Charleston
- Optical Goods Repair & Service, Charleston - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Charleston
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- Opticians, Charleston
- Optometrists, Charleston - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Charleston - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Charleston
- Organ Donation & Tissue Banks, Charleston
- Ornamental Nursery, Charleston
- Ornamental Nursery Services, Charleston
- Orthodontist, Charleston - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Charleston
- Orthopedic & Prosthetic Appliances & Shoes, Charleston - Orthopedic Shoes
- Orthopedists, Charleston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Charleston
- Other Attorneys & Lawyers, Charleston
- Other Attorneys & Lawyers, Charleston
- Other Building Materials & Supplies, Charleston
- Other Electrical Products, Charleston
- Other Lawyers & Attorneys, Charleston
- Other Lodging, Charleston
- Other Specialties, Charleston - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Charleston
- Outdoor Advertising & Billboard, Charleston
- Outdoor Equipment & Accessories, Charleston
- Outdoor Furniture & Patio Furniture, Charleston - Garden Furniture Stores
- Outerwear Stores, Charleston - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Charleston - Outpatient Care
- Overhead Door, Charleston
- Ownership Organizations, Charleston
- Oxygen & Respiratory Equipment & Supplies, Charleston - Oxygen Concentrator, Tank, Machine, etc
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