- Laboratories Dental, Manhasset
- Laboratories Medical, Manhasset
- Laboratory Equipment Repair & Service, Manhasset
- Landscape Contractors & Designers, Manhasset
- Landscaping, Manhasset
- Laser Equipment Repair & Service, Manhasset
- Laundry Self Service, Manhasset
- Lawyers & Attorneys, Manhasset
- Leather Goods Stores & Dealers, Manhasset
- Legal & Tax Services, Manhasset
- Legal Professionals, Manhasset
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- Libraries, Manhasset
- Life Insurance, Manhasset
- Limousine Service, Manhasset
- Linens, Manhasset
- Liquor Stores, Manhasset
- Locks, Manhasset
- Locksmiths, Manhasset - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Manhasset
- Lodging, Manhasset
- Long Haul Trucking Companies, Manhasset
- Lutheran Church, Manhasset
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