- Obstetricians & Gynecologists, Barberton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Barberton
- Occupational Health Care Physicians & Surgeons, Barberton - Occupational Medicine
- Occupational Health Care Professionals, Barberton
- Occupational Medicine Doctors, Barberton - Physicians & Surgeons
- Office Buildings & Parks, Barberton
- Office Supplies, Equipment & Office Furniture Stores, Barberton
- Oil Change & Lubrication, Barberton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Barberton - Oil Companies
- Oils Industrial, Barberton
- Ophthalmologists, Barberton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Barberton - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Barberton
- Opticians, Barberton
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- Optometrists, Barberton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Barberton - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Barberton
- Ornamental Greenhouses, Barberton
- Ornamental Metal Work, Barberton - Steel, Iron, Bronze, etc
- Ornamental Nursery, Barberton
- Ornamental Nursery Services, Barberton
- Orthodontist, Barberton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Barberton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Barberton
- Otolaryngologists, Barberton - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Barberton
- Outdoor Furniture & Patio Furniture, Barberton - Garden Furniture Stores
- Outpatient Services, Barberton - Outpatient Care
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