- Obstetricians & Gynecologists, Huntingdon Valley - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Huntingdon Valley - Occupational Medicine
- Occupational Health Care Professionals, Huntingdon Valley
- Occupational Medicine Doctors, Huntingdon Valley - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Huntingdon Valley
- Oil Change & Lubrication, Huntingdon Valley - Auto Oil & Quick Lube
- Ophthalmologists, Huntingdon Valley - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Huntingdon Valley
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntingdon Valley
- Opticians, Huntingdon Valley
- Optometrists, Huntingdon Valley - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Huntingdon Valley
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- Ornamental Nursery, Huntingdon Valley
- Ornamental Nursery Services, Huntingdon Valley
- Orthodontist, Huntingdon Valley - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Huntingdon Valley - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Huntingdon Valley - Physicians & Surgeons
- Other Attorneys & Lawyers, Huntingdon Valley
- Other Attorneys & Lawyers, Huntingdon Valley
- Other Building Materials & Supplies, Huntingdon Valley
- Other Lawyers & Attorneys, Huntingdon Valley
- Outdoor Equipment & Accessories, Huntingdon Valley
- Overhead Door, Huntingdon Valley
- Oxygen & Respiratory Equipment & Supplies, Huntingdon Valley - Oxygen Concentrator, Tank, Machine, etc
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