- Occupational Health Care Professionals, Truro
- Occupational Therapy, Truro - Occupational Health Specialists
- Office & Meeting Equipment & Supplies Rental, Truro
- Office Buildings & Parks, Truro
- Office Furniture & Equipment Rental & Leasing, Truro
- Office Supplies, Equipment & Office Furniture Stores, Truro
- Oil & Gas Companies, Truro
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Truro
- Opticians, Truro
- Optometrists, Truro - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Truro
- Ornamental Nursery Services, Truro
- Orthopedic & Prosthetic Appliances & Shoes, Truro - Orthopedic Shoes
- Orthopedic Appliances, Truro
- Other Building Materials & Supplies, Truro
- Other Lodging, Truro
- Outdoor Advertising & Billboard, Truro
- Outdoor Equipment & Accessories, Truro
- Outdoor Nature & Recycling Program Schools, Truro
- Overhead Door, Truro
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