- Obstetricians & Gynecologists, Washington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Washington - Occupational Medicine
- Occupational Health Care Professionals, Washington
- Office Supplies, Equipment & Office Furniture Stores, Washington
- Oil Change & Lubrication, Washington - Auto Oil & Quick Lube
- Oncologists, Washington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Washington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Washington
- Opticians, Washington
- Optometrists, Washington - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Washington - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Iron - Residential, Washington - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Washington - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Washington
- Ornamental Nursery Services, Washington
- Orthodontist, Washington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic Appliances, Washington
- Orthopedists, Washington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Washington - Physicians & Surgeons
- Other Building Materials & Supplies, Washington
- Other Electrical Products, Washington
- Outdoor & Lawn & Garden Equipment Repair & Service, Washington
- Outdoor Equipment & Accessories, Washington
- Overhead Door, Washington
- Oxygen & Respiratory Equipment & Supplies, Washington - Oxygen Concentrator, Tank, Machine, etc
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