- Occupational Health & Safety, Burlington
- Occupational Health Care Professionals, Burlington
- Occupational Therapy, Burlington - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Burlington
- Office Buildings & Parks, Burlington
- Office Furniture & Equipment Rental & Leasing, Burlington
- Office Partitions & Dividers, Burlington
- Office Space on Rent, Burlington - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Gas Companies, Burlington
- Oil & Petroleum Products, Burlington - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Burlington
- Oil Change & Lubrication, Burlington - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Burlington - Eye Clinics
- Oral Surgeon, Burlington - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Burlington
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- Ornamental Nursery, Burlington
- Ornamental Nursery Consultants, Burlington
- Ornamental Nursery Services, Burlington
- Orthodontist, Burlington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Burlington - Orthopedic Shoes
- Orthopedic Appliances, Burlington
- Other Building Materials & Supplies, Burlington
- Other Electrical Products, Burlington
- Other Industrial Contractors, Burlington
- Other Industrial Goods, Burlington
- Outdoor Advertising & Billboard, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outdoor Furniture, Burlington
- Outdoor Furniture & Patio Furniture, Burlington - Garden Furniture Stores
- Outdoor Furniture Manufacturers, Burlington
- Outerwear Stores, Burlington - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Burlington - Outpatient Care
- Overhead Door, Burlington
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