- Obstetricians, Stayton - Obstetrics and Gynecology Doctors, Physicians & Surgeons
- Obstetricians & Gynecologists, Stayton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Stayton
- Occupational Therapy, Stayton - Occupational Health Specialists
- Off Road Vehicles, Stayton
- Off Road Vehicles Parts & Accessories, Stayton
- Oil Change & Lubrication, Stayton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Stayton - Oil Companies
- Old Age Homes Service, Stayton
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Stayton
- Optometrists, Stayton - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Stayton - Eye Clinics
- Orchestras, Symphonies & Bands, Stayton
- Ornamental Greenhouses, Stayton
- Ornamental Nursery, Stayton
- Ornamental Nursery Services, Stayton
- Orthopedists, Stayton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Stayton
- Other Industrial Goods, Stayton
- Outdoor & Lawn & Garden Equipment Repair & Service, Stayton
- Outdoor Equipment & Accessories, Stayton
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