- Laboratories Medical, Glen Head
- Lace & Wrap Knit Fabric Mills, Glen Head
- Land Surveyor, Glen Head - Land Surveying Services
- Landscape Contractors & Designers, Glen Head
- Landscaping, Glen Head
- Lawn & Garden Equipment & Supplies, Glen Head
- Lawn & Garden Services, Glen Head
- Lawn Maintenance Services, Glen Head
- Lawn Mower Repair & Blade Sharpening Service, Glen Head
- Lawn Mowers & Power Equipment, Glen Head
- Lawyers & Attorneys, Glen Head
- Leather Goods & Luggage Repair, Glen Head
- Leather Goods Cleaners & Dyers, Glen Head
- Legal & Tax Services, Glen Head
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- Legal Professionals, Glen Head
- Libraries, Glen Head
- Lighting Fixtures & Equipment, Glen Head
- Limousine Service, Glen Head
- Liquor & Beer Manufacturers, Glen Head
- Liquor Stores, Glen Head
- Live Theaters, Glen Head
- Livestock, Glen Head
- Livestock Dealers, Glen Head
- Loans Personal, Glen Head
- Locksmiths, Glen Head - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Glen Head
- Lutheran Church, Glen Head
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