- Laboratories Medical, Islip
- Land Surveyor, Islip - Land Surveying Services
- Landlord - Tenant Attorneys & Lawyers, Islip
- Landlord - Tenant Lawyers & Attorneys, Islip
- Landlord And Tenant Attorneys & Lawyers, Islip
- Landscape Contractors & Designers, Islip
- Landscaping, Islip
- Lawn & Garden Services, Islip
- Lawn Maintenance Services, Islip
- Lawyers & Attorneys, Islip
- Legal Professionals, Islip
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- Libraries, Islip
- Liquor Stores, Islip
- Loans Personal, Islip
- Locksmiths, Islip - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Islip
- Long Haul Trucking Companies, Islip
- Lumber & Lumber Products, Islip
- Lumber & Lumber Products, Islip
- Luncheonette Restaurants, Islip
- Lutheran Church, Islip
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