- Labor Organizations, Amityville
- Land Surveyor, Amityville - Land Surveying Services
- Landscape Contractors & Designers, Amityville
- Landscape Garden Services, Amityville
- Landscape Lighting, Amityville
- Landscaping, Amityville
- Landscaping Materials & Supplies, Amityville
- Lawn & Garden Equipment & Supplies, Amityville
- Lawn & Garden Services, Amityville
- Lawn & Garden Sprinkler Systems, Amityville
- Lawn Mower Repair & Blade Sharpening Service, Amityville
- Lawyers & Attorneys, Amityville
- Legal Professionals, Amityville
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- Libraries, Amityville
- Limousine Service, Amityville
- Liquor Stores, Amityville
- Loans Personal, Amityville
- Locksmiths, Amityville - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Amityville
- Long Haul Trucking Companies, Amityville
- Lubricating Oils , Amityville - Motor Oil
- Lumber & Lumber Products, Amityville
- Lumber & Lumber Products, Amityville
- Lumber & Wood Products Manufacturers, Amityville
- Lumber Companies, Amityville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Amityville
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