- Obstetricians & Gynecologists, Newark - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Newark
- Occupational Health Care Physicians & Surgeons, Newark - Occupational Medicine
- Occupational Health Care Professionals, Newark
- Occupational Medicine Doctors, Newark - Physicians & Surgeons
- Occupational Therapy, Newark - Occupational Health Specialists
- Office Buildings & Parks, Newark
- Office Equipment & Supplies Manufacturers, Newark
- Office Space on Rent, Newark - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Newark
- Oil & Gas Additives & Supplies, Newark
- Oil & Petroleum Products, Newark - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Newark - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Newark - Oil Companies
- Old Age Homes Service, Newark
- Oncologists, Newark - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Newark - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Newark
- Optical Goods Repair & Service, Newark - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newark
- Opticians, Newark
- Optometrists, Newark - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Newark - Dentists - Oral & Maxillofacial Surgeons
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- Oriental Rugs, Newark
- Ornamental Nursery, Newark
- Ornamental Nursery Services, Newark
- Orthodontist, Newark - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Newark
- Orthopedic & Prosthetic Appliances & Shoes, Newark - Orthopedic Shoes
- Orthopedists, Newark - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Newark
- Osteoporosis Doctors, Newark - Physicians & Surgeons
- Other Building Materials & Supplies, Newark
- Other Electrical Products, Newark
- Other Industrial Contractors, Newark
- Outdoor & Lawn & Garden Equipment Repair & Service, Newark
- Outdoor Advertising & Billboard, Newark
- Outdoor Equipment & Accessories, Newark
- Outdoor Furniture & Patio Furniture, Newark - Garden Furniture Stores
- Outerwear & Accessories Manufacturers, Newark
- Outerwear Stores, Newark - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Newark - Outpatient Care
- Overhead Door, Newark
- Ownership Organizations, Newark
- Oxygen & Respiratory Equipment & Supplies, Newark - Oxygen Concentrator, Tank, Machine, etc
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