- Laboratories Dental, Elmont
- Laboratories Medical, Elmont
- Landscape Contractors & Designers, Elmont
- Landscaping, Elmont
- Laundry Self Service, Elmont
- Lawn & Garden Equipment & Supplies, Elmont
- Lawn & Garden Sprinkler Systems, Elmont
- Lawyers & Attorneys, Elmont
- Legal Professionals, Elmont
- Libraries, Elmont
- Limousine Service, Elmont
- Liquor & Beer Manufacturers, Elmont
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- Liquor Stores, Elmont
- Live Theaters, Elmont
- Livestock, Elmont
- Livestock Dealers, Elmont
- Loans Personal, Elmont
- Locks, Elmont
- Locksmiths, Elmont - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Elmont
- Lodging, Elmont
- Long Haul Trucking Companies, Elmont
- Lutheran Church, Elmont
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