- Occupational Health & Safety, Kenora
- Occupational Health Care Professionals, Kenora
- Office & Meeting Equipment & Supplies Rental, Kenora
- Office Furniture & Equipment Rental & Leasing, Kenora
- Office Supplies, Equipment & Office Furniture Stores, Kenora
- Office Wall Units, Kenora
- Oil Change & Lubrication, Kenora - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Kenora - Oil Companies
- Oil Petroleum Wholesale, Kenora
- Optometrists, Kenora - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Kenora
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- Ornamental Greenhouses, Kenora
- Ornamental Nursery, Kenora
- Ornamental Nursery Services, Kenora
- Orthodox Churches, Kenora
- Orthopedic & Prosthetic Appliances & Shoes, Kenora - Orthopedic Shoes
- Orthopedic Appliances, Kenora
- Other Building Materials & Supplies, Kenora
- Outboard Motors, Kenora
- Outdoor Equipment & Accessories, Kenora
- Oxygen & Respiratory Equipment & Supplies, Kenora - Oxygen Concentrator, Tank, Machine, etc
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