- Occupational Health & Safety, Burlington
- Occupational Health Care Physicians & Surgeons, Burlington - Occupational Medicine
- Occupational Health Care Professionals, Burlington
- Occupational Medicine Doctors, Burlington - Physicians & Surgeons
- Off Road Vehicles, Burlington
- Off Road Vehicles Parts & Accessories, Burlington
- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Petroleum Products, Burlington - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Burlington - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Burlington
- Ornamental Nursery Services, Burlington
- Orthodontist, Burlington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Burlington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Burlington - Physicians & Surgeons
- Other Building Materials & Supplies, Burlington
- Other Industrial Contractors, Burlington
- Outboard Motors, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outpatient Services, Burlington - Outpatient Care
- Outsourcing Services, Burlington
- Oxygen & Respiratory Equipment & Supplies, Burlington - Oxygen Concentrator, Tank, Machine, etc
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