- Labor Organizations, Drummondville
- Labor Unions, Drummondville
- Laboratories Dental, Drummondville
- Laboratories Medical, Drummondville
- Laboratory Equipment Repair & Service, Drummondville
- Ladders Wholesale, Drummondville
- Land Surveyor, Drummondville - Land Surveying Services
- Landscape Contractors & Designers, Drummondville
- Landscaping, Drummondville
- Language Schools, Drummondville
- Laser Equipment Repair & Service, Drummondville
- Laundry Sewing & Repair, Drummondville
- Lawn & Garden Equipment & Supplies, Drummondville
- Lawn & Garden Services, Drummondville
- Lawn Furnishings, Drummondville
- Lawn Maintenance Services, Drummondville
- Lawn Mowers & Power Equipment, Drummondville
- Lawyers & Attorneys, Drummondville
- Legal & Tax Services, Drummondville
- Legal Professionals, Drummondville
- Libraries, Drummondville
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- Licensed Counselors, Drummondville
- Lighting Fixtures & Equipment, Drummondville
- Lime, Drummondville
- Lingerie & Underwear for Women, Drummondville - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, Drummondville
- Liquor Stores, Drummondville
- Lithographic Printing, Drummondville
- Livestock, Drummondville
- Livestock Services, Drummondville
- Local & Short Haul Trucking Companies, Drummondville
- Locks, Drummondville
- Locksmiths, Drummondville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Drummondville
- Lodging, Drummondville
- Long Haul Trucking Companies, Drummondville
- Long Term Care Facility, Drummondville
- Lubricating Oils , Drummondville - Motor Oil
- Luggage & Accessories , Drummondville
- Lumber & Wood Products Manufacturers, Drummondville
- Lumber Mills Equipment & Supplies, Drummondville
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