- Labels & Tags, Sayville
- Laboratories Medical, Sayville
- Land Surveyor, Sayville - Land Surveying Services
- Landscape Contractors & Designers, Sayville
- Landscape Garden Services, Sayville
- Landscape Lighting, Sayville
- Landscaping, Sayville
- Late Night Restaurants, Sayville
- Laundry Self Service, Sayville
- Lawn & Garden Equipment & Supplies, Sayville
- Lawn & Garden Services, Sayville
- Lawn & Garden Sprinkler Systems, Sayville
- Lawyers & Attorneys, Sayville
- Legal & Tax Services, Sayville
- Legal Professionals, Sayville
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- Libraries, Sayville
- Licensed Counselors, Sayville
- Life Insurance, Sayville
- Lighting Fixtures & Equipment, Sayville
- Limousine Service, Sayville
- Lingerie & Underwear for Women, Sayville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Sayville
- Loading Dock Equipment, Sayville
- Locks, Sayville
- Locksmiths, Sayville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sayville
- Lodging, Sayville
- Long Haul Trucking Companies, Sayville
- Lutheran Church, Sayville
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