- Obstetricians & Gynecologists, Hermiston - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Hermiston - Occupational Medicine
- Occupational Health Care Professionals, Hermiston
- Occupational Medicine Doctors, Hermiston - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Hermiston
- Oil & Gas Companies, Hermiston
- Oil & Petroleum Products, Hermiston - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Hermiston - Auto Oil & Quick Lube
- Old Age Homes Service, Hermiston
- Ophthalmologists, Hermiston - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Hermiston
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hermiston
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- Opticians, Hermiston
- Optometrists, Hermiston - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Hermiston
- Ornamental Nursery Services, Hermiston
- Orthodontist, Hermiston - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Hermiston - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Hermiston - Physicians & Surgeons
- Other Building Materials & Supplies, Hermiston
- Other Specialties, Hermiston - Doctors, Physicians & Surgeons
- Outdoor Equipment & Accessories, Hermiston
- Oxygen & Respiratory Equipment & Supplies, Hermiston - Oxygen Concentrator, Tank, Machine, etc
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