- Occupational Health Care Professionals, Rochester
- Occupational Therapy, Rochester - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Rochester
- Oil & Gas Well Drilling Services, Rochester
- Oil Change & Lubrication, Rochester - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Rochester - Oil Companies
- Oil Petroleum Wholesale, Rochester
- Oils Industrial, Rochester
- Ophthalmologists, Rochester - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rochester
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- Optometrists, Rochester - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Rochester - Eye Clinics
- Oral Surgeon, Rochester - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Rochester
- Ornamental Nursery Services, Rochester
- Orthotics and Prosthetics, Rochester
- Other Building Materials & Supplies, Rochester
- Outdoor & Lawn & Garden Equipment Repair & Service, Rochester
- Outdoor Equipment & Accessories, Rochester
- Outpatient Services, Rochester - Outpatient Care
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