- Obstetricians & Gynecologists, Fairport - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Fairport
- Office Furniture & Equipment Repair & Refinish, Fairport
- Office Planning & Design, Fairport
- Office Supplies, Equipment & Office Furniture Stores, Fairport
- Oil Change & Lubrication, Fairport - Auto Oil & Quick Lube
- Old Age Homes Service, Fairport
- Ophthalmic Goods, Fairport
- Ophthalmologists, Fairport - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Fairport
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fairport
- Opticians, Fairport
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- Optometrists, Fairport - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Fairport
- Ornamental Greenhouses, Fairport
- Ornamental Nursery, Fairport
- Ornamental Nursery Services, Fairport
- Orthodontist, Fairport - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Fairport
- Other Lodging, Fairport
- Otolaryngologists, Fairport - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Fairport
- Outdoor Equipment & Accessories, Fairport
- Ownership Organizations, Fairport
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