- Obstetricians & Gynecologists, Ellsworth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Ellsworth - Occupational Medicine
- Occupational Health Care Professionals, Ellsworth
- Off Road Vehicles, Ellsworth
- Off Road Vehicles Parts & Accessories, Ellsworth
- Office Supplies, Equipment & Office Furniture Stores, Ellsworth
- Oil & Gas Companies, Ellsworth
- Oil & Petroleum Products, Ellsworth - Merchant, Wholesalers, etc
- Oil Burners Services, Ellsworth
- Oil Change & Lubrication, Ellsworth - Auto Oil & Quick Lube
- Ophthalmologists, Ellsworth - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ellsworth
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- Opticians, Ellsworth
- Optometrists, Ellsworth - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Ellsworth - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Ellsworth
- Ornamental Nursery Services, Ellsworth
- Other Building Materials & Supplies, Ellsworth
- Other Lodging, Ellsworth
- Outboard Motors, Ellsworth
- Outdoor Equipment & Accessories, Ellsworth
- Outpatient Services, Ellsworth - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Ellsworth - Oxygen Concentrator, Tank, Machine, etc
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