- Obstetricians & Gynecologists, Clifton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Clifton
- Occupational Health Care Physicians & Surgeons, Clifton - Occupational Medicine
- Occupational Health Care Professionals, Clifton
- Occupational Medicine Doctors, Clifton - Physicians & Surgeons
- Occupational Therapy, Clifton - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Clifton
- Offset Printing, Clifton
- Oil & Petroleum Products, Clifton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Clifton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Clifton - Oil Companies
- Ophthalmologists, Clifton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Clifton
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Clifton
- Opticians, Clifton
- Optometrists, Clifton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Clifton - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Clifton
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- Oriental Rugs, Clifton
- Ornamental Greenhouses, Clifton
- Ornamental Nursery, Clifton
- Ornamental Nursery Services, Clifton
- Orthodox Churches, Clifton
- Orthopedists, Clifton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Clifton
- Osteoporosis Doctors, Clifton - Physicians & Surgeons
- Other Attorneys & Lawyers, Clifton
- Other Attorneys & Lawyers, Clifton
- Other Building Materials & Supplies, Clifton
- Other Lawyers & Attorneys, Clifton
- Outdoor & Lawn & Garden Equipment Repair & Service, Clifton
- Outdoor Advertising & Billboard, Clifton
- Outdoor Equipment & Accessories, Clifton
- Ownership Organizations, Clifton
- Oxygen & Respiratory Equipment & Supplies, Clifton - Oxygen Concentrator, Tank, Machine, etc
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