- Obstetricians & Gynecologists, Newark - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Newark
- Occupational Health Care Professionals, Newark
- Office Buildings & Parks, Newark
- Office Furniture & Equipment Repair & Refinish, Newark
- Office Machinery, Newark
- Office Partitions & Dividers, 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 & Gas Companies, Newark
- Oil & Gas Exploration & Development, Newark - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Newark - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Newark
- Oil Industry & Oil Field Equipment & Services, Newark - Oil Companies
- Oil Refinery, Newark
- Ophthalmologists, Newark - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newark
- Opticians, Newark
- Optometrists, Newark - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Newark - Eye Clinics
- Orchestras, Symphonies & Bands, Newark
- Organ Donation & Tissue Banks, Newark
- Organizing Services & Products – Household & Business, Newark
- Ornamental Metal Work, Newark - Steel, Iron, Bronze, etc
- Ornamental Nursery, Newark
- Ornamental Nursery Services, Newark
- Orthotics and Prosthetics, Newark
- Other Attorneys & Lawyers, Newark
- Other Attorneys & Lawyers, Newark
- Other Building Materials & Supplies, Newark
- Other Industrial Contractors, Newark
- Other Lawyers & Attorneys, Newark
- Outdoor & Lawn & Garden Equipment Repair & Service, Newark
- Outdoor Advertising & Billboard, Newark
- Outdoor Equipment & Accessories, Newark
- Outerwear & Accessories Manufacturers, Newark
- Outerwear Stores, Newark - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Newark - Outpatient Care
- Outsourcing Services, Newark
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