- Obstetricians & Gynecologists, Clanton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Clanton
- Oil & Gas Companies, Clanton
- Oil & Petroleum Products, Clanton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Clanton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Clanton - Oil Companies
- Oil Petroleum Wholesale, Clanton
- Oils Industrial, Clanton
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Clanton
- Opticians, Clanton
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- Optometrists, Clanton - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Clanton
- Ornamental Nursery, Clanton
- Ornamental Nursery Services, Clanton
- Other Building Materials & Supplies, Clanton
- Outdoor & Lawn & Garden Equipment Repair & Service, Clanton
- Outdoor Advertising & Billboard, Clanton
- Outdoor Equipment & Accessories, Clanton
- Outpatient Services, Clanton - Outpatient Care
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