- Obstetricians & Gynecologists, Deridder - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Oil & Gas Exploration & Development, Deridder - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Deridder - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Deridder - Oil Companies
- Oncologists, Deridder - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Deridder
- Ophthalmologists, Deridder - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Deridder
- Opticians, Deridder
- Optometrists, Deridder - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Deridder
- Ornamental Nursery Services, Deridder
- Orthopedic & Prosthetic Appliances & Shoes, Deridder - Orthopedic Shoes
- Orthopedists, Deridder - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Deridder
- Other Building Materials & Supplies, Deridder
- Other Specialties, Deridder - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Deridder
- Outdoor Equipment & Accessories, Deridder
- Overhead Door, Deridder
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