- Occupational Health Care Physicians & Surgeons, Norristown - Occupational Medicine
- Occupational Health Care Professionals, Norristown
- Occupational Medicine Doctors, Norristown - Physicians & Surgeons
- Occupational Therapy, Norristown - Occupational Health Specialists
- Office Space on Rent, Norristown - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Norristown
- Office Systems Designer & Consultants, Norristown
- Oil Burners Services, Norristown
- Oil Change & Lubrication, Norristown - Auto Oil & Quick Lube
- Ophthalmologists, Norristown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Norristown
- Opticians, Norristown
- Optometrists, Norristown - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Norristown - Dentists - Oral & Maxillofacial Surgeons
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- Organizing Services & Products – Household & Business, Norristown
- Ornamental Greenhouses, Norristown
- Ornamental Nursery, Norristown
- Ornamental Nursery Services, Norristown
- Orthodox Churches, Norristown
- Orthopedic & Prosthetic Appliances & Shoes, Norristown - Orthopedic Shoes
- Orthopedists, Norristown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Norristown
- Osteoporosis Doctors, Norristown - Physicians & Surgeons
- Other Building Materials & Supplies, Norristown
- Outdoor & Lawn & Garden Equipment Repair & Service, Norristown
- Outdoor Equipment & Accessories, Norristown
- Outdoor Furniture & Patio Furniture, Norristown - Garden Furniture Stores
- Outsourcing Services, Norristown
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