- Labor Organizations, Thetford Mines
- Labor Unions, Thetford Mines
- Laboratories Medical, Thetford Mines
- Laboratories Sound Level Testing, Thetford Mines
- Ladders Wholesale, Thetford Mines
- Land Surveyor, Thetford Mines - Land Surveying Services
- Landscape Contractors & Designers, Thetford Mines
- Landscaping, Thetford Mines
- Laundry Sewing & Repair, Thetford Mines
- Lawn & Garden Equipment & Supplies, Thetford Mines
- Lawn & Garden Services, Thetford Mines
- Lawn & Garden Supplies & Equipment, Thetford Mines
- Lawn Maintenance Services, Thetford Mines
- Lawn Mowers & Power Equipment, Thetford Mines
- Lawyers & Attorneys, Thetford Mines
- Leather Goods Cleaners & Dyers, Thetford Mines
- Legal & Tax Services, Thetford Mines
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- Legal Information & Referral Services, Thetford Mines
- Legal Professionals, Thetford Mines
- Linen Supply Services, Thetford Mines
- Liquor Stores, Thetford Mines
- Live Theaters, Thetford Mines
- Livestock, Thetford Mines
- Livestock Services, Thetford Mines
- Local & Short Haul Trucking Companies, Thetford Mines
- Locks, Thetford Mines
- Locksmiths, Thetford Mines - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Thetford Mines
- Lodging, Thetford Mines
- Lodging Services, Thetford Mines
- Long Haul Trucking Companies, Thetford Mines
- Long Term Care Facility, Thetford Mines
- Luggage & Accessories , Thetford Mines
- Lumber Companies, Thetford Mines - Wholesale, Manufacturers & Suppliers
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