- Occupational Health & Safety, Plymouth Meeting
- Occupational Health Care Professionals, Plymouth Meeting
- Occupational Therapy, Plymouth Meeting - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Plymouth Meeting
- Oil Industry & Oil Field Equipment & Services, Plymouth Meeting - Oil Companies
- Oil Refinery, Plymouth Meeting
- Ophthalmologists, Plymouth Meeting - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Plymouth Meeting
- Opticians, Plymouth Meeting
- Optometrists, Plymouth Meeting - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Plymouth Meeting - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Plymouth Meeting
- Ornamental Nursery, Plymouth Meeting
- Ornamental Nursery Services, Plymouth Meeting
- Orthodontist, Plymouth Meeting - Teeth Straightening, Invisalign & Dental Braces
- Orthotics and Prosthetics, Plymouth Meeting
- Other Building Materials & Supplies, Plymouth Meeting
- Outdoor Equipment & Accessories, Plymouth Meeting
- Oxygen & Respiratory Equipment & Supplies, Plymouth Meeting - Oxygen Concentrator, Tank, Machine, etc
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