- Occupational Health & Safety, Drummondville
- Occupational Health Care Professionals, Drummondville
- Office Supplies, Equipment & Office Furniture Stores, Drummondville
- Oil & Gas Companies, Drummondville
- Oil & Petroleum Products, Drummondville - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Drummondville - Oil Companies
- Oils & Greases, Drummondville
- Ophthalmologists, Drummondville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Drummondville
- Optometrists, Drummondville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Drummondville - Eye Clinics
- Ornamental Greenhouses, Drummondville
- Ornamental Nursery, Drummondville
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- Ornamental Nursery Products, Drummondville
- Ornamental Nursery Services, Drummondville
- Orthopedic & Prosthetic Appliances & Shoes, Drummondville - Orthopedic Shoes
- Orthopedists, Drummondville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Drummondville
- Other Building Materials & Supplies, Drummondville
- Other Industrial Goods, Drummondville
- Other Office Supply Stores, Drummondville
- Outboard Motors, Drummondville
- Outdoor Equipment & Accessories, Drummondville
- Overhead Door, Drummondville
- Oxygen & Respiratory Equipment & Supplies, Drummondville - Oxygen Concentrator, Tank, Machine, etc
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