- Laboratories Dental, New Lenox
- Laboratories Medical, New Lenox
- Land Surveyor, New Lenox - Land Surveying Services
- Landscape Contractors & Designers, New Lenox
- Landscape Lighting, New Lenox
- Landscaping, New Lenox
- Landscaping Materials & Supplies, New Lenox
- Lawn & Garden Equipment & Supplies, New Lenox
- Lawn & Garden Services, New Lenox
- Lawn & Garden Sprinkler Systems, New Lenox
- Lawn Maintenance Services, New Lenox
- Lawn Mowers & Power Equipment, New Lenox
- Lawyers & Attorneys, New Lenox
- Legal & Tax Services, New Lenox
- Legal Professionals, New Lenox
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- Libraries, New Lenox
- Life Insurance, New Lenox
- Lighting Fixtures & Equipment, New Lenox
- Limousine Service, New Lenox
- Liquor Stores, New Lenox
- Loans Personal, New Lenox
- Locks, New Lenox
- Locksmiths, New Lenox - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, New Lenox
- Lodging, New Lenox
- Logistics Freight, New Lenox
- Long Haul Trucking Companies, New Lenox
- Luggage & Accessories , New Lenox
- Lumber & Lumber Products, New Lenox
- Lutheran Church, New Lenox
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