- Laboratories Medical, Lemont
- Landscape Contractors & Designers, Lemont
- Landscape Lighting, Lemont
- Landscaping, Lemont
- Landscaping Materials & Supplies, Lemont
- Laundry Self Service, Lemont
- Lawn & Garden Equipment & Supplies, Lemont
- Lawn & Garden Services, Lemont
- Lawn & Garden Sprinkler Systems, Lemont
- Lawn Maintenance Services, Lemont
- Lawn Mower Repair & Blade Sharpening Service, Lemont
- Lawn Mowers & Power Equipment, Lemont
- Lawyers & Attorneys, Lemont
- Legal & Tax Services, Lemont
- Legal Professionals, Lemont
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- Libraries, Lemont
- Life Insurance, Lemont
- Limousine Service, Lemont
- Lining Materials, Lemont
- Liquor & Beer Manufacturers, Lemont
- Liquor Stores, Lemont
- Livestock, Lemont
- Locks, Lemont
- Locksmiths, Lemont - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Lemont
- Lodging, Lemont
- Logistics Freight, Lemont
- Long Haul Trucking Companies, Lemont
- Lutheran Church, Lemont
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