- Laboratories Dental, Southbury
- Laboratories Medical, Southbury
- Land Surveyor, Southbury - Land Surveying Services
- Landscape Contractors & Designers, Southbury
- Landscaping, Southbury
- Landscaping Materials & Supplies, Southbury
- Lawn & Garden Equipment & Supplies, Southbury
- Lawn Mowers & Power Equipment, Southbury
- Lawyers & Attorneys, Southbury
- Legal & Tax Services, Southbury
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- Legal Professionals, Southbury
- Libraries, Southbury
- Lingerie & Underwear for Women, Southbury - Bras, Panties, Bustiers, Corsets & More
- Liquid Waste Treatment, Southbury
- Liquor Stores, Southbury
- Livestock, Southbury
- Loans Personal, Southbury
- Lodging, Southbury
- Lodging Services, Southbury
- Lutheran Church, Southbury
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