- Obstetricians & Gynecologists, Quakertown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Quakertown
- Occupational Therapy, Quakertown - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Quakertown
- Oil & Gas Companies, Quakertown
- Oil Change & Lubrication, Quakertown - Auto Oil & Quick Lube
- Ophthalmologists, Quakertown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Quakertown - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Quakertown
- Opticians, Quakertown
- Optometrists, Quakertown - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Quakertown - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Quakertown
- Ornamental Metal Work, Quakertown - Steel, Iron, Bronze, etc
- Ornamental Nursery, Quakertown
- Ornamental Nursery Services, Quakertown
- Orthodontist, Quakertown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Quakertown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Quakertown
- Outdoor & Lawn & Garden Equipment Repair & Service, Quakertown
- Outdoor Equipment & Accessories, Quakertown
- Outdoor Furniture & Patio Furniture, Quakertown - Garden Furniture Stores
- Outpatient Services, Quakertown - Outpatient Care
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