- Laboratories Dental, North Plainfield
- Laboratories Medical, North Plainfield
- Land Surveyor, North Plainfield - Land Surveying Services
- Landscape Contractors & Designers, North Plainfield
- Landscaping, North Plainfield
- Landscaping Materials & Supplies, North Plainfield
- Language Schools, North Plainfield
- Laundry Self Service, North Plainfield
- Lawn & Garden Equipment & Supplies, North Plainfield
- Lawn & Garden Services, North Plainfield
- Lawn & Garden Sprinkler Systems, North Plainfield
- Lawn Maintenance Services, North Plainfield
- Lawyers & Attorneys, North Plainfield
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- Legal & Tax Services, North Plainfield
- Legal Professionals, North Plainfield
- Libraries, North Plainfield
- Limousine Service, North Plainfield
- Liquor Stores, North Plainfield
- Locks, North Plainfield
- Locksmiths, North Plainfield - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, North Plainfield
- Lodging, North Plainfield
- Long Haul Trucking Companies, North Plainfield
- Lottery Game Retailers, North Plainfield
- Lumber & Lumber Products, North Plainfield
- Lumber & Lumber Products, North Plainfield
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