- Obstetricians & Gynecologists, Prattville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Prattville
- Off Road Vehicles Parts & Accessories, Prattville
- Office Supplies, Equipment & Office Furniture Stores, Prattville
- Oil & Petroleum Products, Prattville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Prattville - Auto Oil & Quick Lube
- Oncologists, Prattville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Prattville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Prattville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Prattville
- Opticians, Prattville
- Optometrists, Prattville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Prattville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Prattville
- Ornamental Nursery Services, Prattville
- Orthodontist, Prattville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Prattville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Prattville
- Other Lodging, Prattville
- Outdoor & Lawn & Garden Equipment Repair & Service, Prattville
- Outdoor Equipment & Accessories, Prattville
- Outdoor Furniture & Patio Furniture, Prattville - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Prattville - Oxygen Concentrator, Tank, Machine, etc
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