- Obstetricians & Gynecologists, Penn Yan - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Penn Yan
- Off Road Vehicles Parts & Accessories, Penn Yan
- Office Supplies, Equipment & Office Furniture Stores, Penn Yan
- Oil Change & Lubrication, Penn Yan - Auto Oil & Quick Lube
- Optometrists, Penn Yan - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Penn Yan
- Ornamental Nursery, Penn Yan
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