- Labor Organizations, East Haven
- Laboratories Medical, East Haven
- Laminated Plastic Plate & Sheet Manufacturers, East Haven
- Laminating Services, East Haven
- Landscape Contractors & Designers, East Haven
- Landscaping, East Haven
- Late Night Restaurants, East Haven
- Latin American Restaurants, East Haven
- Laundromats & Dry-Cleaning, Coin-Operated, East Haven
- Lawn & Garden Services, East Haven
- Lawn Maintenance Services, East Haven
- Lawyers & Attorneys, East Haven
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- Legal & Tax Services, East Haven
- Legal Professionals, East Haven
- Lexus Dealers, East Haven
- Liquid Transportation - Non Hazardous, East Haven
- Liquor Stores, East Haven
- Lithographic Printing, East Haven
- Livestock, East Haven
- Loans Personal, East Haven
- Locksmiths, East Haven - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, East Haven
- Long Haul Trucking Companies, East Haven
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