- Labels & Tags, New Haven
- Labor & Employment Consultants, New Haven
- Labor And Employment Relations Attorneys & Lawyers, New Haven
- Labor And Employment Relations Lawyers & Attorneys, New Haven
- Labor Organizations, New Haven
- Labor Unions, New Haven
- Laboratories Dental, New Haven
- Laboratories Medical, New Haven
- Laminating Services, New Haven
- Land Surveyor, New Haven - Land Surveying Services
- Landscape Contractors & Designers, New Haven
- Landscaping, New Haven
- Landscaping Materials & Supplies, New Haven
- Language Schools, New Haven
- Late Night Restaurants, New Haven
- Laundromats & Dry-Cleaning, Coin-Operated, New Haven
- Law & Financial Printers, New Haven
- Lawn & Garden Decor & Ornaments, New Haven
- Lawn & Garden Services, New Haven
- Lawn Maintenance Services, New Haven
- Lawyers & Attorneys, New Haven
- Lead Paint Testing, Detection & Removal, New Haven
- Leather Goods & Luggage Repair, New Haven
- Legal & Tax Services, New Haven
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- Legal Information & Referral Services, New Haven
- Legal Professionals, New Haven
- Libraries, New Haven
- Life Insurance, New Haven
- Lighting Consultants, New Haven
- Lighting Contractors, New Haven
- Lighting Fixtures & Equipment, New Haven
- Lighting Maintenance, New Haven
- Limousine Service, New Haven
- Linen Supply Services, New Haven
- Liquid Waste Treatment, New Haven
- Liquor Stores, New Haven
- Litigation Support Services, New Haven
- Live Theaters, New Haven
- Living Room Furniture, New Haven
- Loans Personal, New Haven
- Local & Short Haul Trucking Companies, New Haven
- Locks, New Haven
- Locksmiths, New Haven - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, New Haven
- Lodging, New Haven
- Lodging Services, New Haven
- Long Haul Trucking Companies, New Haven
- Lutheran Church, New Haven
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