- Obstetricians & Gynecologists, Newtown Square - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Newtown Square
- Occupational Therapy, Newtown Square - Occupational Health Specialists
- Office Space on Rent, Newtown Square - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Newtown Square
- Oil & Gas Exploration & Development, Newtown Square - Oil Field Exploration, Monitoring & Remediation
- Oil Industry & Oil Field Equipment & Services, Newtown Square - Oil Companies
- Oncologists, Newtown Square - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newtown Square
- Opticians, Newtown Square
- Optometrists, Newtown Square - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, Newtown Square
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- Oriental Rugs, Newtown Square
- Ornamental Greenhouses, Newtown Square
- Ornamental Nursery, Newtown Square
- Ornamental Nursery Services, Newtown Square
- Orthodontist, Newtown Square - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Newtown Square - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Newtown Square - Physicians & Surgeons
- Other Building Materials & Supplies, Newtown Square
- Outdoor & Lawn & Garden Equipment Repair & Service, Newtown Square
- Outdoor Advertising & Billboard, Newtown Square
- Outdoor Equipment & Accessories, Newtown Square
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