- Laboratories Medical, South Amboy
- Land Surveyor, South Amboy - Land Surveying Services
- Landscape Contractors & Designers, South Amboy
- Landscaping, South Amboy
- Landscaping Materials & Supplies, South Amboy
- Lawn & Garden Services, South Amboy
- Lawn Maintenance Services, South Amboy
- Lawyers & Attorneys, South Amboy
- Legal & Tax Services, South Amboy
- Legal Professionals, South Amboy
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- Libraries, South Amboy
- Limousine Service, South Amboy
- Liquor Stores, South Amboy
- Loans Personal, South Amboy
- Locks, South Amboy
- Locksmiths, South Amboy - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, South Amboy
- Lodging, South Amboy
- Long Haul Trucking Companies, South Amboy
- Lumber Companies, South Amboy - Wholesale, Manufacturers & Suppliers
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