- Obstetricians & Gynecologists, Burlington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Burlington
- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Gas Companies, Burlington
- Oil Brokers, Burlington
- Online Advertising, Burlington - Internet Advertising
- Ophthalmologists, Burlington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Burlington - Eye Clinics
- Organizing Services & Products – Household & Business, Burlington
- Ornamental Nursery, Burlington
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- Ornamental Nursery Services, Burlington
- Orthodontist, Burlington - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Burlington - Orthopedic Shoes
- Orthopedic Shoes, Burlington
- Orthopedists, Burlington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Burlington
- Other Building Materials & Supplies, Burlington
- Other Lodging, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outdoor Furniture & Patio Furniture, Burlington - Garden Furniture Stores
- Outerwear Stores, Burlington - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outplacement Consultants, Burlington
- Outsourcing Services, Burlington
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