- Labor & Employment Consultants, Piscataway
- Laboratories Dental, Piscataway
- Laboratories Medical, Piscataway
- Land Surveyor, Piscataway - Land Surveying Services
- Landscape Contractors & Designers, Piscataway
- Landscape Design & Installation, Piscataway
- Landscaping, Piscataway
- Laundry & Dry Cleaning Equipment & Supplies, Piscataway - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Self Service, Piscataway
- Lawn & Garden Equipment & Supplies, Piscataway
- Lawn & Garden Services, Piscataway
- Lawn & Garden Sprinkler Systems, Piscataway
- Lawn Maintenance Services, Piscataway
- Lawyers & Attorneys, Piscataway
- Legal & Tax Services, Piscataway
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- Legal Professionals, Piscataway
- Letter Shop & Addressing Services, Piscataway
- Life Insurance, Piscataway
- Limousine Service, Piscataway
- Liquor Stores, Piscataway
- Live Theaters, Piscataway
- Loans Personal, Piscataway
- Local & Short Haul Trucking Companies, Piscataway
- Locksmiths, Piscataway - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Piscataway
- Lodging Services, Piscataway
- Long Haul Trucking Companies, Piscataway
- Lumber & Lumber Products, Piscataway
- Lumber & Lumber Products, Piscataway
- Lutheran Church, Piscataway
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