- Office Supplies, Equipment & Office Furniture Stores, Collegeville
- Oil Change & Lubrication, Collegeville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Collegeville - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Collegeville
- Opticians, Collegeville
- Optometrists, Collegeville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Collegeville - Eye Clinics
- Oral Surgeon, Collegeville - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Collegeville
- Ornamental Greenhouses, Collegeville
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- Ornamental Nursery, Collegeville
- Ornamental Nursery Services, Collegeville
- Orthodontist, Collegeville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Collegeville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Collegeville
- Other Building Materials & Supplies, Collegeville
- Outdoor & Lawn & Garden Equipment Repair & Service, Collegeville
- Outdoor Equipment & Accessories, Collegeville
- Ownership Organizations, Collegeville
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