- Labor & Employment Consultants, New Britain
- Labor And Employment Relations Attorneys & Lawyers, New Britain
- Labor And Employment Relations Lawyers & Attorneys, New Britain
- Labor Organizations, New Britain
- Labor Unions, New Britain
- Laboratories Medical, New Britain
- Landscape Contractors & Designers, New Britain
- Landscaping, New Britain
- Landscaping Materials & Supplies, New Britain
- Late Night Restaurants, New Britain
- Laundromats & Dry-Cleaning, Coin-Operated, New Britain
- Laundry & Dry Cleaning Equipment & Supplies, New Britain - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, New Britain
- Lawn & Garden Services, New Britain
- Lawn Maintenance Services, New Britain
- Lawyers & Attorneys, New Britain
- Legal Professionals, New Britain
- Libraries, New Britain
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- Life Insurance, New Britain
- Lighting Fixtures & Equipment, New Britain
- Limousine Service, New Britain
- Liquor Stores, New Britain
- Live Theaters, New Britain
- Loans Personal, New Britain
- Local & Short Haul Trucking Companies, New Britain
- Locks, New Britain
- Locksmiths, New Britain - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, New Britain
- Lodging, New Britain
- Lodging Services, New Britain
- Long Haul Trucking Companies, New Britain
- Lumber & Lumber Products, New Britain
- Lumber & Lumber Products, New Britain
- Lumber Companies, New Britain - Wholesale, Manufacturers & Suppliers
- Lutheran Church, New Britain
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