- Obstetricians & Gynecologists, Ellwood City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Ellwood City
- Occupational Therapy, Ellwood City - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Ellwood City
- Oil Industry & Oil Field Equipment & Services, Ellwood City - Oil Companies
- Oil Refinery, Ellwood City
- Ophthalmologists, Ellwood City - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ellwood City
- Optometrists, Ellwood City - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ellwood City - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Ellwood City
- Ornamental Nursery, Ellwood City
- Ornamental Nursery Services, Ellwood City
- Orthodontist, Ellwood City - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Ellwood City - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Ellwood City - Physicians & Surgeons
- Other Building Materials & Supplies, Ellwood City
- Outpatient Clinics, Ellwood City - Care & Treatment Centers
- Outpatient Services, Ellwood City - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Ellwood City - Oxygen Concentrator, Tank, Machine, etc
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