- Occupational Health Care Professionals, Havertown
- Occupational Therapy, Havertown - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Havertown
- Oil Change & Lubrication, Havertown - Auto Oil & Quick Lube
- Oil Extraction Downhole, Havertown
- Oil Industry & Oil Field Equipment & Services, Havertown - Oil Companies
- Ophthalmologists, Havertown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Havertown
- Opticians, Havertown
- Optometrists, Havertown - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Havertown
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- Ornamental Nursery, Havertown
- Ornamental Nursery Services, Havertown
- Orthodontist, Havertown - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Havertown
- Orthopedic & Prosthetic Appliances & Shoes, Havertown - Orthopedic Shoes
- Orthopedists, Havertown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Havertown
- Osteoporosis Doctors, Havertown - Physicians & Surgeons
- Other Building Materials & Supplies, Havertown
- Outdoor & Lawn & Garden Equipment Repair & Service, Havertown
- Outdoor Equipment & Accessories, Havertown
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