- Obstetricians & Gynecologists, Massillon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Massillon
- Oil & Gas Companies, Massillon
- Oil & Petroleum Products, Massillon - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Massillon - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Massillon - Oil Companies
- Oil Well Casing & Pulling, Massillon
- Old Age Homes Service, Massillon
- Open Bible Church, Massillon
- Ophthalmologists, Massillon - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Massillon - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Massillon
- Opticians, Massillon
- Optometrists, Massillon - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Massillon
- Ornamental Nursery Services, Massillon
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- Orthodontist, Massillon - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Massillon - Orthopedic Shoes
- Orthopedists, Massillon - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Massillon
- Other Attorneys & Lawyers, Massillon
- Other Building Materials & Supplies, Massillon
- Other Industrial Contractors, Massillon
- Other Lawyers & Attorneys, Massillon
- Other Lodging, Massillon
- Outdoor & Lawn & Garden Equipment Repair & Service, Massillon
- Outdoor Equipment & Accessories, Massillon
- Outdoor Furniture & Patio Furniture, Massillon - Garden Furniture Stores
- Outpatient Services, Massillon - Outpatient Care
- Overhead Door, Massillon
- Oxygen & Respiratory Equipment & Supplies, Massillon - Oxygen Concentrator, Tank, Machine, etc
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