- Obstetricians & Gynecologists, Norfolk - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Norfolk - Occupational Medicine
- Occupational Health Care Professionals, Norfolk
- Off Road Vehicles, Norfolk
- Off Road Vehicles Parts & Accessories, Norfolk
- Office Buildings & Parks, Norfolk
- Office Furniture & Equipment Repair & Refinish, Norfolk
- Office Space on Rent, Norfolk - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Norfolk
- Oil Change & Lubrication, Norfolk - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Norfolk - Oil Companies
- Oil Petroleum Wholesale, Norfolk
- Oncologists, Norfolk - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Norfolk
- Ophthalmic Goods, Norfolk
- Ophthalmic Instruments & Machinery, Norfolk
- Ophthalmologists, Norfolk - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Norfolk
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Norfolk
- Opticians, Norfolk
- Optometrists, Norfolk - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Norfolk - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Norfolk
- Organ Donation & Tissue Banks, Norfolk
- Organizing Services & Products – Household & Business, Norfolk
- Oriental Food Products, Norfolk
- Oriental Rugs, Norfolk
- Ornamental Metal Work, Norfolk - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Norfolk
- Ornamental Nursery Services, Norfolk
- Orthodontist, Norfolk - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Norfolk
- Orthodox Synagogues, Norfolk
- Orthopedic & Prosthetic Appliances & Shoes, Norfolk - Orthopedic Shoes
- Orthopedic Shoes, Norfolk
- Orthopedists, Norfolk - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Norfolk
- Other Attorneys & Lawyers, Norfolk
- Other Attorneys & Lawyers, Norfolk
- Other Building Materials & Supplies, Norfolk
- Other Electrical Products, Norfolk
- Other Lawyers & Attorneys, Norfolk
- Other Lodging, Norfolk
- Other Office Supply Stores, Norfolk
- Outboard Motors Parts & Repair, Norfolk
- Outdoor & Lawn & Garden Equipment Repair & Service, Norfolk
- Outdoor Advertising & Billboard, Norfolk
- Outdoor Centers, Norfolk
- Outdoor Equipment & Accessories, Norfolk
- Outdoor Furniture & Patio Furniture, Norfolk - Garden Furniture Stores
- Outdoor Power Equipment, Norfolk
- Outerwear & Accessories Manufacturers, Norfolk
- Outerwear Stores, Norfolk - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Norfolk - Outpatient Care
- Ownership Organizations, Norfolk
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