- Obstetricians & Gynecologists, Oswego - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Oswego
- Office Supplies, Equipment & Office Furniture Stores, Oswego
- Oil Burners Services, Oswego
- Oil Change & Lubrication, Oswego - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Oswego - Oil Companies
- Oil Refinery, Oswego
- Oils Industrial, Oswego
- Oncologists, Oswego - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Oswego - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oswego
- Opticians, Oswego
- Optometrists, Oswego - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Oswego - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Oswego
- Ornamental Nursery, Oswego
- Ornamental Nursery Services, Oswego
- Orthopedic Shoes, Oswego
- Orthopedists, Oswego - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Oswego
- Other Attorneys & Lawyers, Oswego
- Other Building Materials & Supplies, Oswego
- Other Lawyers & Attorneys, Oswego
- Other Lodging, Oswego
- Outdoor & Lawn & Garden Equipment Repair & Service, Oswego
- Outdoor Equipment & Accessories, Oswego
- Oxygen & Respiratory Equipment & Supplies, Oswego - Oxygen Concentrator, Tank, Machine, etc
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