- Occupational Health & Safety, Kanata
- Occupational Health Care Professionals, Kanata
- Office Supplies, Equipment & Office Furniture Stores, Kanata
- Oil & Gas Companies, Kanata
- Oil Change & Lubrication, Kanata - Auto Oil & Quick Lube
- Old Age Homes Service, Kanata
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kanata
- Opticians, Kanata
- Optometrists, Kanata - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Kanata
- Ornamental Nursery, Kanata
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- Ornamental Nursery Services, Kanata
- Orthodontist, Kanata - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Kanata - Orthopedic Shoes
- Other Attorneys & Lawyers, Kanata
- Other Attorneys & Lawyers, Kanata
- Other Building Materials & Supplies, Kanata
- Other Lawyers & Attorneys, Kanata
- Outdoor Equipment & Accessories, Kanata
- Overhead Door, Kanata
- Oxygen & Respiratory Equipment & Supplies, Kanata - Oxygen Concentrator, Tank, Machine, etc
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