- Obstetricians & Gynecologists, South Plainfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, South Plainfield
- Occupational Health Care Professionals, South Plainfield
- Office Buildings & Parks, South Plainfield
- Office Supplies, Equipment & Office Furniture Stores, South Plainfield
- Oil & Gas Companies, South Plainfield
- Oil & Gas Exploration & Development, South Plainfield - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, South Plainfield - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, South Plainfield - Oil Companies
- Ophthalmic Goods, South Plainfield
- Ophthalmic Instruments & Machinery, South Plainfield
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Plainfield
- Opticians, South Plainfield
- Optometrists, South Plainfield - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, South Plainfield - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, South Plainfield
- Ornamental Nursery, South Plainfield
- Ornamental Nursery Services, South Plainfield
- Orthodontist, South Plainfield - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, South Plainfield
- Orthopedists, South Plainfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, South Plainfield
- Other Building Materials & Supplies, South Plainfield
- Other Electrical Products, South Plainfield
- Other Industrial Contractors, South Plainfield
- Outdoor & Lawn & Garden Equipment Repair & Service, South Plainfield
- Outdoor Equipment & Accessories, South Plainfield
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