- Obstetricians & Gynecologists, Everett - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Oil Industry & Oil Field Equipment & Services, Everett - Oil Companies
- Oil Petroleum Wholesale, Everett
- Ophthalmologists, Everett - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Everett
- Opticians, Everett
- Optometrists, Everett - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Everett - Eye Clinics
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- Oral Surgeon, Everett - Dentists - Oral & Maxillofacial Surgeons
- Orthopedic & Prosthetic Appliances & Shoes, Everett - Orthopedic Shoes
- Orthopedists, Everett - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Everett
- Other Building Materials & Supplies, Everett
- Otolaryngologists, Everett - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Oxygen & Respiratory Equipment & Supplies, Everett - Oxygen Concentrator, Tank, Machine, etc
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