- Obstetricians & Gynecologists, Zanesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Zanesville
- Occupational Health Care Professionals, Zanesville
- Off Road Vehicles, Zanesville
- Off Road Vehicles Parts & Accessories, Zanesville
- Office Supplies, Equipment & Office Furniture Stores, Zanesville
- Oil & Gas Exploration & Development, Zanesville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Zanesville - Companies
- Oil & Petroleum Products, Zanesville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Zanesville - Auto Oil & Quick Lube
- Oil Field Equipment Repairing, Zanesville
- Oil Field Services Testing Measuring & Surveying, Zanesville
- Oil Industry & Oil Field Equipment & Services, Zanesville - Oil Companies
- Oil Well Equipment & Supplies, Zanesville
- Oilfield Trucking, Zanesville
- Old Age Homes Service, Zanesville
- Oncologists, Zanesville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Zanesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Zanesville
- Optical Goods Repair & Service, Zanesville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Zanesville
- Opticians, Zanesville
- Optometrists, Zanesville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Zanesville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, Zanesville
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- Ornamental Greenhouses, Zanesville
- Ornamental Metal Work, Zanesville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Zanesville
- Ornamental Nursery Services, Zanesville
- Orthodontist, Zanesville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Zanesville - Orthopedic Shoes
- Orthopedists, Zanesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Zanesville
- Osteoporosis Doctors, Zanesville - Physicians & Surgeons
- Other Attorneys & Lawyers, Zanesville
- Other Attorneys & Lawyers, Zanesville
- Other Building Materials & Supplies, Zanesville
- Other Industrial Contractors, Zanesville
- Other Lawyers & Attorneys, Zanesville
- Other Lodging, Zanesville
- Other Office Supply Stores, Zanesville
- Outdoor & Lawn & Garden Equipment Repair & Service, Zanesville
- Outdoor Advertising & Billboard, Zanesville
- Outdoor Equipment & Accessories, Zanesville
- Outdoor Furniture & Patio Furniture, Zanesville - Garden Furniture Stores
- Outerwear Stores, Zanesville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Zanesville - Care & Treatment Centers
- Outpatient Services, Zanesville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Zanesville - Oxygen Concentrator, Tank, Machine, etc
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