- Obstetricians & Gynecologists, Corvallis - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Corvallis - Occupational Medicine
- Occupational Health Care Professionals, Corvallis
- Occupational Medicine Doctors, Corvallis - Physicians & Surgeons
- Off Road Vehicles, Corvallis
- Off Road Vehicles Parts & Accessories, Corvallis
- Office Supplies, Equipment & Office Furniture Stores, Corvallis
- Oil & Petroleum Products, Corvallis - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Corvallis - Auto Oil & Quick Lube
- Oncologists, Corvallis - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Corvallis - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Corvallis
- Opticians, Corvallis
- Optometrists, Corvallis - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Corvallis - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Metal Work, Corvallis - Steel, Iron, Bronze, etc
- Ornamental Nursery, Corvallis
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- Ornamental Nursery Products, Corvallis
- Ornamental Nursery Services, Corvallis
- Orthodontist, Corvallis - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Corvallis
- Orthopedic & Prosthetic Appliances & Shoes, Corvallis - Orthopedic Shoes
- Orthopedists, Corvallis - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Corvallis
- Other Attorneys & Lawyers, Corvallis
- Other Attorneys & Lawyers, Corvallis
- Other Building Materials & Supplies, Corvallis
- Other Lawyers & Attorneys, Corvallis
- Other Lodging, Corvallis
- Outdoor & Lawn & Garden Equipment Repair & Service, Corvallis
- Outdoor Equipment & Accessories, Corvallis
- Outdoor Furniture & Patio Furniture, Corvallis - Garden Furniture Stores
- Overhead Door, Corvallis
- Oxygen & Respiratory Equipment & Supplies, Corvallis - Oxygen Concentrator, Tank, Machine, etc
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