- Obstetricians & Gynecologists, Centreville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Centreville
- Occupational Therapy, Centreville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Centreville
- Oil Change & Lubrication, Centreville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Centreville - Oil Companies
- Oil Refinery, Centreville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Centreville
- Opticians, Centreville
- Optometrists, Centreville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Centreville - Eye Clinics
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- Oral Surgeon, Centreville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Centreville
- Oriental Restaurants, Centreville
- Ornamental Nursery, Centreville
- Ornamental Nursery Services, Centreville
- Orthopedists, Centreville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Centreville
- Outdoor & Lawn & Garden Equipment Repair & Service, Centreville
- Outdoor Equipment & Accessories, Centreville
- Ownership Organizations, Centreville
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