- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Petroleum Products, Burlington - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Burlington - Auto Oil & Quick Lube
- Oncologists, Burlington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Burlington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Burlington - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Burlington
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- Ornamental Greenhouses, Burlington
- Ornamental Nursery, Burlington
- Ornamental Nursery Products, Burlington
- Ornamental Nursery Services, Burlington
- Other Building Materials & Supplies, Burlington
- Other Office Supply Stores, Burlington
- Outdoor & Lawn & Garden Equipment Repair & Service, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outpatient Clinics, Burlington - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Burlington - Oxygen Concentrator, Tank, Machine, etc
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