- Obstetricians & Gynecologists, Meadville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Machinery, Meadville
- Office Supplies, Equipment & Office Furniture Stores, Meadville
- Oil & Gas Exploration & Development, Meadville - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Meadville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Meadville - Oil Companies
- Oncologists, Meadville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Meadville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Meadville
- Opticians, Meadville
- Optometrists, Meadville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Meadville - Eye Clinics
- Oral Surgeon, Meadville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Meadville
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- Ornamental Nursery, Meadville
- Ornamental Nursery Products, Meadville
- Ornamental Nursery Services, Meadville
- Orthopedic & Prosthetic Appliances & Shoes, Meadville - Orthopedic Shoes
- Orthopedists, Meadville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Meadville
- Osteoporosis Doctors, Meadville - Physicians & Surgeons
- Other Building Materials & Supplies, Meadville
- Other Lodging, Meadville
- Outdoor & Lawn & Garden Equipment Repair & Service, Meadville
- Outdoor Equipment & Accessories, Meadville
- Outdoor Furniture, Meadville
- Outdoor Furniture & Patio Furniture, Meadville - Garden Furniture Stores
- Outpatient Services, Meadville - Outpatient Care
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