- Obstetricians & Gynecologists, Brecksville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Brecksville
- Office Supplies, Equipment & Office Furniture Stores, Brecksville
- Oil & Gas Exploration & Development, Brecksville - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Brecksville - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Brecksville - Oil Companies
- Oil Synthetic, Brecksville
- Oils Industrial, Brecksville
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- Ophthalmologists, Brecksville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Brecksville
- Opticians, Brecksville
- Optometrists, Brecksville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orthodontist, Brecksville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Brecksville - Orthopedic Shoes
- Orthotics and Prosthetics, Brecksville
- Outdoor Equipment & Accessories, Brecksville
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