- Labels & Tags, Trumbull
- Laboratories Medical, Trumbull
- Landscape Contractors & Designers, Trumbull
- Landscaping, Trumbull
- Lawn & Garden Equipment & Supplies, Trumbull
- Lawn & Garden Services, Trumbull
- Lawn Maintenance Services, Trumbull
- Lawyers & Attorneys, Trumbull
- Leather Goods Stores & Dealers, Trumbull
- Legal & Tax Services, Trumbull
- Legal Information Service, Trumbull
- Legal Professionals, Trumbull
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- Life Insurance, Trumbull
- Lighting Consultants, Trumbull
- Lighting Contractors, Trumbull
- Limousine Service, Trumbull
- Lingerie & Underwear for Women, Trumbull - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Trumbull
- Locksmiths, Trumbull - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Trumbull
- Long Haul Trucking Companies, Trumbull
- Lp Gas Equipment & Supplies, Trumbull
- Lumber Companies, Trumbull - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Trumbull
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