- Obstetricians & Gynecologists, Duncan - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Duncan
- Off Road Vehicles Parts & Accessories, Duncan
- Office Supplies, Equipment & Office Furniture Stores, Duncan
- Oil & Gas Consultants, Duncan
- Oil & Gas Exploration & Development, Duncan - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Duncan
- Oil & Gas Producers, Duncan - Companies
- Oil & Gas Well Drilling Services, Duncan
- Oil & Petroleum Products, Duncan - Merchant, Wholesalers, etc
- Oil & Petroleum Retail, Duncan
- Oil Change & Lubrication, Duncan - Auto Oil & Quick Lube
- Oil Field Contractors, Duncan
- Oil Field Supplies Rental, Duncan
- Oil Industry & Oil Field Equipment & Services, Duncan - Oil Companies
- Oilfield Trucking, Duncan
- Oncologists, Duncan - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Duncan - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Duncan
- Opticians, Duncan
- Optometrists, Duncan - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Duncan - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Duncan
- Ornamental Nursery Services, Duncan
- Orthodontist, Duncan - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Duncan - Orthopedic Shoes
- Orthopedists, Duncan - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Duncan - Physicians & Surgeons
- Other Building Materials & Supplies, Duncan
- Other Lodging, Duncan
- Outdoor & Lawn & Garden Equipment Repair & Service, Duncan
- Outpatient Clinics, Duncan - Care & Treatment Centers
- Outpatient Services, Duncan - Outpatient Care
- Overhead Door, Duncan
- Oxygen & Respiratory Equipment & Supplies, Duncan - Oxygen Concentrator, Tank, Machine, etc
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