- Obstetricians & Gynecologists, Durham - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Durham
- Occupational Health Care Professionals, Durham
- Occupational Therapy, Durham - Occupational Health Specialists
- Off Road Vehicles, Durham
- Off Road Vehicles Parts & Accessories, Durham
- Office & Meeting Equipment & Supplies Rental, Durham
- Office Buildings & Parks, Durham
- Office Furniture & Equipment Rental & Leasing, Durham
- Office Space on Rent, Durham - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Durham
- Oil & Gas Companies, Durham
- Oil Change & Lubrication, Durham - Auto Oil & Quick Lube
- Oil Extraction Downhole, Durham
- Oil Industry & Oil Field Equipment & Services, Durham - Oil Companies
- Online Advertising, Durham - Internet Advertising
- Ophthalmologists, Durham - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Durham - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Durham
- Opticians, Durham
- Optometrists, Durham - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Durham - Dentists - Oral & Maxillofacial Surgeons
- Oriental Massage, Durham
- Oriental Restaurants, Durham
- Ornamental Greenhouses, Durham
- Ornamental Metal Work, Durham - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Durham
- Ornamental Nursery Products, Durham
- Ornamental Nursery Services, Durham
- Orthodontist, Durham - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Durham
- Orthopedic & Prosthetic Appliances & Shoes, Durham - Orthopedic Shoes
- Orthopedists, Durham - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Durham
- Other Attorneys & Lawyers, Durham
- Other Attorneys & Lawyers, Durham
- Other Building Materials & Supplies, Durham
- Other Lawyers & Attorneys, Durham
- Other Lodging, Durham
- Other Specialties, Durham - Doctors, Physicians & Surgeons
- Outboard Motors, Durham
- Outdoor & Lawn & Garden Equipment Repair & Service, Durham
- Outdoor Equipment & Accessories, Durham
- Outdoor Furniture, Durham
- Outdoor Furniture & Patio Furniture, Durham - Garden Furniture Stores
- Outerwear Stores, Durham - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Durham - Care & Treatment Centers
- Outpatient Services, Durham - Outpatient Care
- Outsourcing Services, Durham
- Ownership Organizations, Durham
- Oxygen & Respiratory Equipment & Supplies, Durham - Oxygen Concentrator, Tank, Machine, etc
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