- Obstetricians & Gynecologists, Baker City - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Baker City
- Occupational Therapy, Baker City - Occupational Health Specialists
- Off Road Vehicles, Baker City
- Off Road Vehicles Parts & Accessories, Baker City
- Office Supplies, Equipment & Office Furniture Stores, Baker City
- Oil Change & Lubrication, Baker City - Auto Oil & Quick Lube
- Optical Goods Repair & Service, Baker City - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Baker City
- Opticians, Baker City
- Optometrists, Baker City - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Baker City - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Baker City
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- Ornamental Nursery, Baker City
- Ornamental Nursery Services, Baker City
- Orthodontist, Baker City - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Baker City - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Baker City
- Other Attorneys & Lawyers, Baker City
- Other Building Materials & Supplies, Baker City
- Other Lawyers & Attorneys, Baker City
- Outdoor & Lawn & Garden Equipment Repair & Service, Baker City
- Outdoor Equipment & Accessories, Baker City
- Outpatient Services, Baker City - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Baker City - Oxygen Concentrator, Tank, Machine, etc
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