- Occupational Health & Safety, Barre
- Occupational Health Care Professionals, Barre
- Office Supplies, Equipment & Office Furniture Stores, Barre
- Oil & Gas Additives & Supplies, Barre
- Oil Change & Lubrication, Barre - Auto Oil & Quick Lube
- Opera Companies, Barre
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Barre
- Opticians, Barre
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- Optometrists, Barre - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Barre
- Ornamental Nursery, Barre
- Ornamental Nursery Services, Barre
- Orthodontist, Barre - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Barre
- Outdoor Equipment & Accessories, Barre
- Outpatient Services, Barre - Outpatient Care
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