- Laboratories Medical, Branford
- Landscape Contractors & Designers, Branford
- Landscaping, Branford
- Landscaping Materials & Supplies, Branford
- Laundromats & Dry-Cleaning, Coin-Operated, Branford
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Branford
- Lawn & Garden Equipment & Supplies, Branford
- Lawn & Garden Services, Branford
- Lawn Maintenance Services, Branford
- Lawn Mowers & Power Equipment, Branford
- Lawyers & Attorneys, Branford
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- Legal Professionals, Branford
- Libraries, Branford
- Lime & Limestone, Branford
- Livestock, Branford
- Locksmiths, Branford - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Branford
- Lodging Services, Branford
- Loggers, Branford
- Long Haul Trucking Companies, Branford
- Lumber Brokers, Branford
- Lumber Companies, Branford - Wholesale, Manufacturers & Suppliers
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