- Landscape Contractors & Designers, Farmingville
- Landscaping, Farmingville
- Laundromats & Dry-Cleaning, Coin-Operated, Farmingville
- Laundry & Dry Cleaning Equipment & Supplies, Farmingville - Cleaners & Dryers Sales, Repair, Service & Leasing
- Lawn & Garden Equipment & Supplies, Farmingville
- Lawn & Garden Services, Farmingville
- Lawn & Garden Sprinkler Systems, Farmingville
- Lawn Maintenance Services, Farmingville
- Lawn Mowers & Power Equipment, Farmingville
- Lawyers & Attorneys, Farmingville
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- Legal Professionals, Farmingville
- Lingerie & Underwear for Women, Farmingville - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Farmingville
- Loans Personal, Farmingville
- Locksmiths, Farmingville - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Farmingville
- Long Haul Trucking Companies, Farmingville
- Lumber & Lumber Products, Farmingville
- Lumber & Lumber Products, Farmingville
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