- Office Buildings & Parks, Orillia
- Office Supplies, Equipment & Office Furniture Stores, Orillia
- Oil & Gas Companies, Orillia
- Oil Change & Lubrication, Orillia - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Orillia
- Opticians, Orillia
- Optometrists, Orillia - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Orillia - Eye Clinics
- Ornamental Nursery, Orillia
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- Ornamental Nursery Consultants, Orillia
- Ornamental Nursery Services, Orillia
- Orthopedic & Prosthetic Appliances & Shoes, Orillia - Orthopedic Shoes
- Other Building Materials & Supplies, Orillia
- Other Lodging, Orillia
- Outdoor Equipment & Accessories, Orillia
- Outpatient Services, Orillia - Outpatient Care
- Overhead Door, Orillia
- Oxygen & Respiratory Equipment & Supplies, Orillia - Oxygen Concentrator, Tank, Machine, etc
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