- Occupational Health & Safety, Hood River
- Occupational Health Care Professionals, Hood River
- Occupational Therapy, Hood River - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Hood River
- Oil & Gas Companies, Hood River
- Oil Change & Lubrication, Hood River - Auto Oil & Quick Lube
- Online Advertising, Hood River - Internet Advertising
- Ophthalmologists, Hood River - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hood River
- Opticians, Hood River
- Optometrists, Hood River - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Hood River - Eye Clinics
- Orchard Equipment, Hood River
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- Orchard Service, Hood River
- Ornamental Nursery, Hood River
- Ornamental Nursery Services, Hood River
- Orthodontist, Hood River - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Hood River - Orthopedic Shoes
- Other Building Materials & Supplies, Hood River
- Other Lodging, Hood River
- Outdoor & Lawn & Garden Equipment Repair & Service, Hood River
- Outdoor Equipment & Accessories, Hood River
- Outerwear & Accessories Manufacturers, Hood River
- Outpatient Services, Hood River - Outpatient Care
- Overhead Door, Hood River
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