- Open Bible Church, Vermillion
- Ophthalmologists, Vermillion - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vermillion
- Opticians, Vermillion
- Optometrists, Vermillion - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Vermillion
- Ornamental Nursery, Vermillion
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- Ornamental Nursery Services, Vermillion
- Orthodontist, Vermillion - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Vermillion - Orthopedic Shoes
- Orthotics and Prosthetics, Vermillion
- Other Building Materials & Supplies, Vermillion
- Oxygen & Respiratory Equipment & Supplies, Vermillion - Oxygen Concentrator, Tank, Machine, etc
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