- Obstetricians & Gynecologists, Jenkintown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Jenkintown
- Oil & Petroleum Products, Jenkintown - Merchant, Wholesalers, etc
- Ophthalmologists, Jenkintown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Jenkintown
- Opticians, Jenkintown
- Optometrists, Jenkintown - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Jenkintown - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Jenkintown
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- Ornamental Nursery, Jenkintown
- Ornamental Nursery Services, Jenkintown
- Orthodontist, Jenkintown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Jenkintown - Orthopedic Shoes
- Orthotics and Prosthetics, Jenkintown
- Osteoporosis Doctors, Jenkintown - Physicians & Surgeons
- Other Attorneys & Lawyers, Jenkintown
- Other Building Materials & Supplies, Jenkintown
- Outdoor Equipment & Accessories, Jenkintown
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