- Occupational Health & Safety, Middlebury
- Occupational Health Care Professionals, Middlebury
- Off Road Vehicles, Middlebury
- Off Road Vehicles Parts & Accessories, Middlebury
- Office Supplies, Equipment & Office Furniture Stores, Middlebury
- Oil & Petroleum Products, Middlebury - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Middlebury - Oil Companies
- Oil Petroleum Wholesale, Middlebury
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- Ophthalmologists, Middlebury - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Middlebury
- Optometrists, Middlebury - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Middlebury
- Ornamental Nursery Services, Middlebury
- Orthodontist, Middlebury - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Middlebury
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