- Labor & Employment Consultants, Hauppauge
- Labor Organizations, Hauppauge
- Labor Relations Counselors, Hauppauge
- Labor Unions, Hauppauge
- Laboratories Medical, Hauppauge
- Land Surveyor, Hauppauge - Land Surveying Services
- Landscape Contractors & Designers, Hauppauge
- Landscaping, Hauppauge
- Laser Printers, Hauppauge - Office Supplies
- Laundry Self Service, Hauppauge
- Lawn & Garden Equipment & Supplies, Hauppauge
- Lawn & Garden Services, Hauppauge
- Lawn & Tree Service, Hauppauge
- Lawn Care Products, Hauppauge
- Lawn Maintenance Services, Hauppauge
- Lawyers & Attorneys, Hauppauge
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- Legal & Tax Services, Hauppauge
- Legal Professionals, Hauppauge
- Libraries, Hauppauge
- Licensed Counselors, Hauppauge
- Life Insurance, Hauppauge
- Lighting Fixtures & Equipment, Hauppauge
- Limousine Service, Hauppauge
- Lingerie & Underwear for Women, Hauppauge - Bras, Panties, Bustiers, Corsets & More
- Liquor Stores, Hauppauge
- Live Theaters, Hauppauge
- Loans Personal, Hauppauge
- Lodging, Hauppauge
- Lodging Services, Hauppauge
- Long Haul Trucking Companies, Hauppauge
- Lubricating Oils , Hauppauge - Motor Oil
- Lumber & Wood Products Manufacturers, Hauppauge
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