- Office Supplies, Equipment & Office Furniture Stores, Newberg
- Oil & Gas Companies, Newberg
- Oil & Petroleum Products, Newberg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Newberg - Auto Oil & Quick Lube
- Old Age Homes Service, Newberg
- Open Bible Church, Newberg
- Ophthalmologists, Newberg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newberg
- Opticians, Newberg
- Optometrists, Newberg - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Newberg - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Newberg
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- Ornamental Iron Work, Newberg
- Ornamental Nursery, Newberg
- Ornamental Nursery Products, Newberg
- Ornamental Nursery Services, Newberg
- Orthodontist, Newberg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Newberg - Orthopedic Shoes
- Orthopedists, Newberg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Newberg
- Other Lodging, Newberg
- Outdoor & Lawn & Garden Equipment Repair & Service, Newberg
- Outdoor Equipment & Accessories, Newberg
- Overhead Door, Newberg
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