- Obstetricians & Gynecologists, Pittsford - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Pittsford
- Office Supplies, Equipment & Office Furniture Stores, Pittsford
- Oil & Gas Companies, Pittsford
- Old Age Homes Service, Pittsford
- Ophthalmologists, Pittsford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Pittsford
- Opticians, Pittsford
- Optometrists, Pittsford - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Pittsford - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Pittsford
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- Ornamental Nursery Products, Pittsford
- Ornamental Nursery Services, Pittsford
- Orthodontist, Pittsford - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Pittsford
- Other Attorneys & Lawyers, Pittsford
- Other Electrical Products, Pittsford
- Other Lawyers & Attorneys, Pittsford
- Other Lodging, Pittsford
- Outdoor Equipment & Accessories, Pittsford
- Ownership Organizations, Pittsford
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