- Occupational Health Care Physicians & Surgeons, Walla Walla - Occupational Medicine
- Occupational Health Care Professionals, Walla Walla
- Occupational Medicine Doctors, Walla Walla - Physicians & Surgeons
- Off Road Vehicles, Walla Walla
- Off Road Vehicles Parts & Accessories, Walla Walla
- Office Supplies, Equipment & Office Furniture Stores, Walla Walla
- Oil & Gas Exploration & Development, Walla Walla - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Walla Walla - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Walla Walla - Oil Companies
- Old Age Homes Service, Walla Walla
- Oncologists, Walla Walla - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Walla Walla - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Walla Walla
- Opticians, Walla Walla
- Optometrists, Walla Walla - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Walla Walla - Eye Clinics
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- Oral Surgeon, Walla Walla - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Walla Walla
- Orchestras, Symphonies & Bands, Walla Walla
- Ornamental Nursery, Walla Walla
- Ornamental Nursery Products, Walla Walla
- Ornamental Nursery Services, Walla Walla
- Orthopedic & Prosthetic Appliances & Shoes, Walla Walla - Orthopedic Shoes
- Orthopedists, Walla Walla - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Walla Walla
- Other Attorneys & Lawyers, Walla Walla
- Other Building Materials & Supplies, Walla Walla
- Other Lawyers & Attorneys, Walla Walla
- Outdoor Equipment & Accessories, Walla Walla
- Outdoor Furniture & Patio Furniture, Walla Walla - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Walla Walla - Oxygen Concentrator, Tank, Machine, etc
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