- Laboratories Medical, East Northport
- Ladies Ready To Wear, East Northport
- Landscape Contractors & Designers, East Northport
- Landscape Lighting, East Northport
- Landscaping, East Northport
- Landscaping Materials & Supplies, East Northport
- Late Night Restaurants, East Northport
- Laundries Full Service Commercial, East Northport
- Laundry Self Service, East Northport
- Lawn & Garden Equipment & Supplies, East Northport
- Lawn & Garden Services, East Northport
- Lawn & Garden Sprinkler Systems, East Northport
- Lawn Maintenance Services, East Northport
- Lawn Mower Repair & Blade Sharpening Service, East Northport
- Lawn Mowers & Power Equipment, East Northport
- Lawyers & Attorneys, East Northport
- Legal & Tax Services, East Northport
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- Legal Professionals, East Northport
- Libraries, East Northport
- Limousine Service, East Northport
- Linens, East Northport
- Lingerie & Underwear for Women, East Northport - Bras, Panties, Bustiers, Corsets & More
- Liquor & Beer Manufacturers, East Northport
- Liquor Stores, East Northport
- Live Theaters, East Northport
- Loans Personal, East Northport
- Locks, East Northport
- Locksmiths, East Northport - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, East Northport
- Long Haul Trucking Companies, East Northport
- Lumber & Lumber Products, East Northport
- Lumber & Lumber Products, East Northport
- Luncheonette Restaurants, East Northport
- Lutheran Church, East Northport
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