- Laboratories Medical, Sayreville
- Land Surveyor, Sayreville - Land Surveying Services
- Landscape Contractors & Designers, Sayreville
- Landscaping, Sayreville
- Lasers & Electro Optics Consultants, Sayreville
- Late Night Restaurants, Sayreville
- Lawn & Garden Services, Sayreville
- Lawyers & Attorneys, Sayreville
- Leather Goods Cleaners & Dyers, Sayreville
- Legal Professionals, Sayreville
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- Limousine Service, Sayreville
- Liquor Stores, Sayreville
- Lithography Equipment & Supplies, Sayreville
- Locks, Sayreville
- Locksmiths, Sayreville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Sayreville
- Lodging, Sayreville
- Long Haul Trucking Companies, Sayreville
- Lubricating Oils , Sayreville - Motor Oil
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