- Office Supplies, Equipment & Office Furniture Stores, Monticello
- Oil Burners Services, Monticello
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Monticello
- Opticians, Monticello
- Optometrists, Monticello - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Monticello - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Monticello
- Ornamental Nursery, Monticello
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