- Occupational Health Care Professionals, Corsicana
- Occupational Therapy, Corsicana - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Corsicana
- Oil & Gas Companies, Corsicana
- Oil & Gas Producers, Corsicana - Companies
- Oil & Gas Well Drilling Services, Corsicana
- Oil & Petroleum Retail, Corsicana
- Oil Change & Lubrication, Corsicana - Auto Oil & Quick Lube
- Oil Field Contractors, Corsicana
- Oil Industry & Oil Field Equipment & Services, Corsicana - Oil Companies
- Oil Well Equipment & Supplies, Corsicana
- Open Door Church, Corsicana
- Ophthalmologists, Corsicana - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Corsicana
- Opticians, Corsicana
- Optometrists, Corsicana - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Corsicana - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Corsicana
- Ornamental Nursery Products, Corsicana
- Ornamental Nursery Services, Corsicana
- Orthodontist, Corsicana - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Corsicana - Orthopedic Shoes
- Orthopedic Appliances, Corsicana
- Orthotics and Prosthetics, Corsicana
- Other Building Materials & Supplies, Corsicana
- Other Office Supply Stores, Corsicana
- Outdoor & Lawn & Garden Equipment Repair & Service, Corsicana
- Outdoor Advertising & Billboard, Corsicana
- Outdoor Equipment & Accessories, Corsicana
- Overhead Door, Corsicana
- Oxygen & Respiratory Equipment & Supplies, Corsicana - Oxygen Concentrator, Tank, Machine, etc
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