- Office Equipment & Supplies Manufacturers, Burlington
- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Gas Additives & Supplies, Burlington
- Oil & Gas Companies, Burlington
- Oil & Petroleum Products, Burlington - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Burlington - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Burlington - Oil Companies
- Oil Petroleum Wholesale, Burlington
- Oil Refinery, Burlington
- Optical Goods Repair & Service, Burlington - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
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- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Metal Work, Burlington - Steel, Iron, Bronze, etc
- Ornamental Nursery, Burlington
- Ornamental Nursery Products, Burlington
- Ornamental Nursery Services, Burlington
- Other Building Materials & Supplies, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outdoor Furniture & Patio Furniture, Burlington - Garden Furniture Stores
- Outpatient Services, Burlington - Outpatient Care
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