- Occupational Health & Safety, Levittown
- Occupational Health Care Physicians & Surgeons, Levittown - Occupational Medicine
- Occupational Health Care Professionals, Levittown
- Occupational Medicine Doctors, Levittown - Physicians & Surgeons
- Office Buildings & Parks, Levittown
- Office Partitions & Dividers, Levittown
- Office Supplies, Equipment & Office Furniture Stores, Levittown
- Oil & Gas Exploration & Development, Levittown - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Levittown - Auto Oil & Quick Lube
- Oil Field Maintenance, Levittown
- Oil Industry & Oil Field Equipment & Services, Levittown - Oil Companies
- Oil Petroleum Wholesale, Levittown
- Oil Well Casing & Pulling, Levittown
- Ophthalmologists, Levittown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Levittown
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- Opticians, Levittown
- Optometrists, Levittown - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Levittown - Eye Clinics
- Oriental Massage, Levittown
- Ornamental Nursery, Levittown
- Ornamental Nursery Services, Levittown
- Orthodontist, Levittown - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Levittown
- Orthopedists, Levittown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Levittown
- Osteoporosis Doctors, Levittown - Physicians & Surgeons
- Other Building Materials & Supplies, Levittown
- Other Office Supply Stores, Levittown
- Outdoor Equipment & Accessories, Levittown
- Oxygen & Respiratory Equipment & Supplies, Levittown - Oxygen Concentrator, Tank, Machine, etc
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