- Laboratories Medical, Farmingdale
- Land Surveyor, Farmingdale - Land Surveying Services
- Landscape Contractors & Designers, Farmingdale
- Landscaping, Farmingdale
- Landscaping Materials & Supplies, Farmingdale
- Laundry Self Service, Farmingdale
- Lawn & Garden Equipment & Supplies, Farmingdale
- Lawn & Garden Services, Farmingdale
- Lawn & Garden Sprinkler Systems, Farmingdale
- Lawn & Tree Service, Farmingdale
- Lawn Maintenance Services, Farmingdale
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- Lead Testing, Detection & Removal - Commercial & Industrial, Farmingdale - Lead Paint
- Lead Testing, Detection & Removal - Residential, Farmingdale - Lead Paint
- Lighting Fixtures & Equipment, Farmingdale
- Limousine Service, Farmingdale
- Liquor Stores, Farmingdale
- Local & Short Haul Trucking Companies, Farmingdale
- Long Haul Trucking Companies, Farmingdale
- Lubricating Oils & Greases, Farmingdale
- Lumber Companies, Farmingdale - Wholesale, Manufacturers & Suppliers
- Luncheonette Restaurants, Farmingdale
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