- Obstetricians & Gynecologists, Sumter - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Sumter
- Occupational Therapy, Sumter - Occupational Health Specialists
- Off Road Vehicles, Sumter
- Off Road Vehicles Parts & Accessories, Sumter
- Office Supplies, Equipment & Office Furniture Stores, Sumter
- Oil Change & Lubrication, Sumter - Auto Oil & Quick Lube
- Oil Extraction Downhole, Sumter
- Oil Industry & Oil Field Equipment & Services, Sumter - Oil Companies
- Oil Petroleum Wholesale, Sumter
- Oils Industrial, Sumter
- Open Bible Church, Sumter
- Ophthalmologists, Sumter - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Sumter - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sumter
- Opticians, Sumter
- Optometrists, Sumter - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Sumter - Eye Clinics
- Oral Surgeon, Sumter - Dentists - Oral & Maxillofacial Surgeons
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- Oriental Goods & Products Stores, Sumter
- Ornamental Greenhouses, Sumter
- Ornamental Metal Work, Sumter - Steel, Iron, Bronze, etc
- Ornamental Nursery, Sumter
- Ornamental Nursery Services, Sumter
- Orthodontist, Sumter - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Sumter - Orthopedic Shoes
- Orthopedists, Sumter - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Sumter
- Other Attorneys & Lawyers, Sumter
- Other Building Materials & Supplies, Sumter
- Other Industrial Contractors, Sumter
- Other Lawyers & Attorneys, Sumter
- Outboard Motors, Sumter
- Outdoor & Lawn & Garden Equipment Repair & Service, Sumter
- Outdoor Advertising & Billboard, Sumter
- Outdoor Equipment & Accessories, Sumter
- Outdoor Furniture & Patio Furniture, Sumter - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Sumter - Oxygen Concentrator, Tank, Machine, etc
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