- Obstetricians & Gynecologists, Elizabeth City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Elizabeth City
- Occupational Therapy, Elizabeth City - Occupational Health Specialists
- Off Road Vehicles, Elizabeth City
- Off Road Vehicles Parts & Accessories, Elizabeth City
- Office Equipment & Supplies Manufacturers, Elizabeth City
- Office Supplies, Equipment & Office Furniture Stores, Elizabeth City
- Oil & Gas Companies, Elizabeth City
- Oil & Petroleum Products, Elizabeth City - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Elizabeth City - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Elizabeth City - Oil Companies
- Oil Petroleum Wholesale, Elizabeth City
- Oncologists, Elizabeth City - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Elizabeth City - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Elizabeth City - Camera Repair
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Elizabeth City
- Opticians, Elizabeth City
- Optometrists, Elizabeth City - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Elizabeth City - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Elizabeth City
- Ornamental Nursery Products, Elizabeth City
- Ornamental Nursery Services, Elizabeth City
- Orthodontist, Elizabeth City - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Elizabeth City
- Other Electrical Products, Elizabeth City
- Outdoor Advertising & Billboard, Elizabeth City
- Outdoor Equipment & Accessories, Elizabeth City
- Outpatient Services, Elizabeth City - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Elizabeth City - Oxygen Concentrator, Tank, Machine, etc
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