- Obstetricians & Gynecologists, Rochester - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Rochester
- Oil & Gas Companies, Rochester
- Oil & Petroleum Products, Rochester - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Rochester - Auto Oil & Quick Lube
- Old Age Homes Service, Rochester
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rochester
- Optometrists, Rochester - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Rochester - Eye Clinics
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- Ornamental Greenhouses, Rochester
- Ornamental Nursery, Rochester
- Ornamental Nursery Services, Rochester
- Osteoporosis Doctors, Rochester - Physicians & Surgeons
- Other Building Materials & Supplies, Rochester
- Outdoor & Lawn & Garden Equipment Repair & Service, Rochester
- Outdoor Equipment & Accessories, Rochester
- Overhead Door, Rochester
- Oxygen & Respiratory Equipment & Supplies, Rochester - Oxygen Concentrator, Tank, Machine, etc
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