- Office Supplies, Equipment & Office Furniture Stores, Castlegar
- Oil & Gas Companies, Castlegar
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Castlegar
- Optometrists, Castlegar - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Castlegar
- Ornamental Nursery, Castlegar
- Ornamental Nursery Services, Castlegar
- Orthopedic & Prosthetic Appliances & Shoes, Castlegar - Orthopedic Shoes
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- Orthopedic Shoes, Castlegar
- Other Building Materials & Supplies, Castlegar
- Other Industrial Contractors, Castlegar
- Outdoor & Lawn & Garden Equipment Repair & Service, Castlegar
- Outdoor Equipment & Accessories, Castlegar
- Overhead Door, Castlegar
- Oxygen & Respiratory Equipment & Supplies, Castlegar - Oxygen Concentrator, Tank, Machine, etc
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