- Obstetricians & Gynecologists, Rochester - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Rochester
- Occupational Health Care Physicians & Surgeons, Rochester - Occupational Medicine
- Occupational Health Care Professionals, Rochester
- Occupational Medicine Doctors, Rochester - Physicians & Surgeons
- Occupational Therapy, Rochester - Occupational Health Specialists
- Off Road Vehicles, Rochester
- Off Road Vehicles Parts & Accessories, Rochester
- Office & Meeting Equipment & Supplies Rental, Rochester
- Office Buildings & Parks, Rochester
- Office Furniture & Equipment Rental & Leasing, Rochester
- Office Machinery, Rochester
- Office Partitions & Dividers, Rochester
- Office Space on Rent, Rochester - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Rochester
- Oil & Gas Exploration & Development, Rochester - Oil Field Exploration, Monitoring & Remediation
- Oil & Petroleum Products, Rochester - Merchant, Wholesalers, etc
- Oil Burners Services, Rochester
- Oil Change & Lubrication, Rochester - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Rochester - Oil Companies
- Oil Petroleum Wholesale, Rochester
- Oil Refinery, Rochester
- Old Age Homes Service, Rochester
- Oncologists, Rochester - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmic Goods, Rochester
- Ophthalmic Instruments & Machinery, Rochester
- Ophthalmologists, Rochester - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Rochester
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rochester
- Opticians, Rochester
- Optometrists, Rochester - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Rochester - Eye Clinics
- Oral Surgeon, Rochester - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Rochester
- Organic Farms, Rochester
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- Organizations Equipment & Supplies, Rochester
- Organizing Services & Products – Household & Business, Rochester
- Organs Tuning & Repair, Rochester
- Oriental Food Products, Rochester
- Oriental Goods & Products Stores, Rochester
- Ornamental Nursery, Rochester
- Ornamental Nursery Products, Rochester
- Ornamental Nursery Services, Rochester
- Orthodontist, Rochester - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Rochester
- Orthodox Synagogues, Rochester
- Orthopedic & Prosthetic Appliances & Shoes, Rochester - Orthopedic Shoes
- Orthopedic Shoes, Rochester
- Orthopedists, Rochester - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Rochester
- Other Attorneys & Lawyers, Rochester
- Other Building Materials & Supplies, Rochester
- Other Electrical Products, Rochester
- Other Industrial Contractors, Rochester
- Other Lawyers & Attorneys, Rochester
- Other Lodging, Rochester
- Other Office Supply Stores, Rochester
- Other Specialties, Rochester - Doctors, Physicians & Surgeons
- Outboard Motors, Rochester
- Outdoor & Lawn & Garden Equipment Repair & Service, Rochester
- Outdoor Advertising & Billboard, Rochester
- Outdoor Equipment & Accessories, Rochester
- Outdoor Furniture, Rochester
- Outdoor Furniture & Patio Furniture, Rochester - Garden Furniture Stores
- Outerwear Stores, Rochester - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Rochester - Care & Treatment Centers
- Outpatient Services, Rochester - Outpatient Care
- Overhead Door, Rochester
- Ownership Organizations, Rochester
- Oxygen & Respiratory Equipment & Supplies, Rochester - Oxygen Concentrator, Tank, Machine, etc
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