- Obstetricians & Gynecologists, Phoenixville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Phoenixville
- Occupational Therapy, Phoenixville - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Phoenixville
- Office Furniture & Equipment Rental & Leasing, Phoenixville
- Office Space on Rent, Phoenixville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Phoenixville
- Oil Change & Lubrication, Phoenixville - Auto Oil & Quick Lube
- Oil Extraction Downhole, Phoenixville
- Oil Industry & Oil Field Equipment & Services, Phoenixville - Oil Companies
- Ophthalmologists, Phoenixville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Phoenixville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Phoenixville
- Opticians, Phoenixville
- Optometrists, Phoenixville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Phoenixville - Eye Clinics
- Oral Surgeon, Phoenixville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Phoenixville
- Ornamental Nursery, Phoenixville
- Ornamental Nursery Services, Phoenixville
- Orthodontist, Phoenixville - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Phoenixville
- Orthopedists, Phoenixville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Phoenixville
- Other Building Materials & Supplies, Phoenixville
- Outdoor Centers, Phoenixville
- Outdoor Equipment & Accessories, Phoenixville
- Outdoor Furniture & Patio Furniture, Phoenixville - Garden Furniture Stores
- Outpatient Services, Phoenixville - Outpatient Care
- Overhead Door, Phoenixville
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