- Obstetricians & Gynecologists, the Dalles - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, the Dalles
- Occupational Health Care Physicians & Surgeons, the Dalles - Occupational Medicine
- Occupational Health Care Professionals, the Dalles
- Office Supplies, Equipment & Office Furniture Stores, the Dalles
- Oil & Gas Companies, the Dalles
- Oil Change & Lubrication, the Dalles - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, the Dalles - Oil Companies
- Oncologists, the Dalles - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, the Dalles - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, the Dalles
- Opticians, the Dalles
- Optometrists, the Dalles - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, the Dalles - Eye Clinics
- Oral Surgeon, the Dalles - Dentists - Oral & Maxillofacial Surgeons
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- Orchard Service, the Dalles
- Oriental Restaurants, the Dalles
- Ornamental Nursery, the Dalles
- Ornamental Nursery Services, the Dalles
- Orthodontist, the Dalles - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, the Dalles - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, the Dalles
- Other Electrical Products, the Dalles
- Outdoor Advertising & Billboard, the Dalles
- Outdoor Equipment & Accessories, the Dalles
- Outdoor Furniture & Patio Furniture, the Dalles - Garden Furniture Stores
- Outpatient Clinics, the Dalles - Care & Treatment Centers
- Outpatient Services, the Dalles - Outpatient Care
- Overhead Door, the Dalles
- Oxygen & Respiratory Equipment & Supplies, the Dalles - Oxygen Concentrator, Tank, Machine, etc
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