- Obstetricians & Gynecologists, Burlington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Burlington
- Occupational Rehabilitation, Burlington
- Off Road Vehicles, Burlington
- Off Road Vehicles Parts & Accessories, Burlington
- Office & Meeting Equipment & Supplies Rental, Burlington
- Office Furniture & Equipment Rental & Leasing, Burlington
- Office Supplies, Equipment & Office Furniture Stores, Burlington
- Oil & Gas Companies, Burlington
- Oil Industry & Oil Field Equipment & Services, Burlington - Oil Companies
- Oncologists, Burlington - Cancer Doctors, Physicians & Surgeons (Oncology)
- Opera Companies, Burlington
- Ophthalmologists, Burlington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Burlington - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Burlington
- Opticians, Burlington
- Optometrists, Burlington - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orchestras, Symphonies & Bands, Burlington
- Ornamental Nursery, Burlington
- Ornamental Nursery Services, Burlington
- Orthodontist, Burlington - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Synagogues, Burlington
- Osteoporosis Doctors, Burlington - Physicians & Surgeons
- Other Attorneys & Lawyers, Burlington
- Other Attorneys & Lawyers, Burlington
- Other Building Materials & Supplies, Burlington
- Other Lawyers & Attorneys, Burlington
- Other Lodging, Burlington
- Other Office Supply Stores, Burlington
- Outdoor Equipment & Accessories, Burlington
- Outdoor Furniture & Patio Furniture, Burlington - Garden Furniture Stores
- Outpatient Services, Burlington - Outpatient Care
- Outplacement Consultants, Burlington
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