- Occupational Health & Safety, South Burlington
- Occupational Health Care Professionals, South Burlington
- Occupational Therapy, South Burlington - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, South Burlington
- Oil Burners, South Burlington
- Oil Burners Services, South Burlington
- Oil Change & Lubrication, South Burlington - Auto Oil & Quick Lube
- Oncologists, South Burlington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, South Burlington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, South Burlington
- Opticians, South Burlington
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- Optometrists, South Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, South Burlington
- Ornamental Nursery, South Burlington
- Ornamental Nursery Services, South Burlington
- Orthodontist, South Burlington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, South Burlington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, South Burlington
- Other Electrical Products, South Burlington
- Outdoor Furniture & Patio Furniture, South Burlington - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, South Burlington - Oxygen Concentrator, Tank, Machine, etc
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