- Laboratories Dental, Torrington
- Laboratories Medical, Torrington
- Lakes & Ponds Construction Maintenance Restoration & Control, Torrington
- Land Surveyor, Torrington - Land Surveying Services
- Landscape Contractors & Designers, Torrington
- Landscaping, Torrington
- Laundry Self Service, Torrington
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Torrington
- Lawn & Garden Equipment & Supplies, Torrington
- Lawn & Garden Services, Torrington
- Lawn Maintenance Services, Torrington
- Lawn Mowers & Power Equipment, Torrington
- Lawn Spraying & Treatment, Torrington
- Lawyers & Attorneys, Torrington
- Legal Professionals, Torrington
- Libraries, Torrington
- Licensed Counselors, Torrington
- Life Insurance, Torrington
- Liquor Stores, Torrington
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- Livestock, Torrington
- Livestock Auctions, Torrington
- Livestock Auctions, Torrington
- Livestock Breeders, Torrington
- Livestock Dealers, Torrington
- Livestock Feeding Service, Torrington
- Livestock Markets, Torrington
- Livestock Services, Torrington
- Loans Personal, Torrington
- Local & Short Haul Trucking Companies, Torrington
- Lodging, Torrington
- Lodging Services, Torrington
- Long Haul Trucking Companies, Torrington
- Lubricating Oils , Torrington - Motor Oil
- Lumber & Lumber Products, Torrington
- Lumber & Lumber Products, Torrington
- Lumber & Wood Products Manufacturers, Torrington
- Lumber Companies, Torrington - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Torrington
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