- Obstetricians & Gynecologists, Parkersburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Parkersburg
- Occupational Therapy, Parkersburg - Occupational Health Specialists
- Off Road Vehicles, Parkersburg
- Off Road Vehicles Parts & Accessories, Parkersburg
- Office Buildings & Parks, Parkersburg
- Office Equipment & Supplies Manufacturers, Parkersburg
- Office Supplies, Equipment & Office Furniture Stores, Parkersburg
- Oil & Gas Exploration & Development, Parkersburg - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Parkersburg - Companies
- Oil Change & Lubrication, Parkersburg - Auto Oil & Quick Lube
- Oil Field Contractors, Parkersburg
- Oil Industry & Oil Field Equipment & Services, Parkersburg - Oil Companies
- Oil Well Equipment & Supplies, Parkersburg
- Oncologists, Parkersburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Parkersburg - Internet Advertising
- Ophthalmologists, Parkersburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Parkersburg
- Opticians, Parkersburg
- Optometrists, Parkersburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Parkersburg - Eye Clinics
- Oral Surgeon, Parkersburg - Dentists - Oral & Maxillofacial Surgeons
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- Orchestras, Symphonies & Bands, Parkersburg
- Ornamental Greenhouses, Parkersburg
- Ornamental Iron Work, Parkersburg
- Ornamental Nursery, Parkersburg
- Ornamental Nursery Services, Parkersburg
- Orthodontist, Parkersburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Parkersburg - Orthopedic Shoes
- Orthopedists, Parkersburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Parkersburg
- Other Building Materials & Supplies, Parkersburg
- Other Electrical Products, Parkersburg
- Other Lodging, Parkersburg
- Other Office Supply Stores, Parkersburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Parkersburg
- Outdoor Advertising & Billboard, Parkersburg
- Outdoor Equipment & Accessories, Parkersburg
- Outdoor Furniture, Parkersburg
- Outdoor Furniture & Patio Furniture, Parkersburg - Garden Furniture Stores
- Outpatient Services, Parkersburg - Outpatient Care
- Overhead Door, Parkersburg
- Oxygen & Respiratory Equipment & Supplies, Parkersburg - Oxygen Concentrator, Tank, Machine, etc
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