- Occupational Health & Safety, Tillsonburg
- Occupational Health Care Professionals, Tillsonburg
- Office & Meeting Equipment & Supplies Rental, Tillsonburg
- Office Buildings & Parks, Tillsonburg
- Office Furniture & Equipment Rental & Leasing, Tillsonburg
- Office Supplies, Equipment & Office Furniture Stores, Tillsonburg
- Oil & Gas Companies, Tillsonburg
- Oil And Petroleum Products, Tillsonburg
- Oil Change & Lubrication, Tillsonburg - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Tillsonburg
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- Optometrists, Tillsonburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Tillsonburg - Eye Clinics
- Oral Surgeon, Tillsonburg - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Tillsonburg
- Ornamental Nursery Services, Tillsonburg
- Orthopedic & Prosthetic Appliances & Shoes, Tillsonburg - Orthopedic Shoes
- Other Building Materials & Supplies, Tillsonburg
- Other Electrical Products, Tillsonburg
- Outdoor Equipment & Accessories, Tillsonburg
- Overhead Door, Tillsonburg
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