- Labor & Employment Consultants, West Chicago
- Labor Organizations, West Chicago
- Land Surveyor, West Chicago - Land Surveying Services
- Landscape Contractors & Designers, West Chicago
- Landscape Lighting, West Chicago
- Landscaping, West Chicago
- Landscaping Materials & Supplies, West Chicago
- Laundry Self Service, West Chicago
- Lawn & Garden Chemicals, Insecticides & Fertilizers, West Chicago
- Lawn & Garden Equipment & Supplies, West Chicago
- Lawn & Garden Services, West Chicago
- Lawn & Garden Sprinkler Systems, West Chicago
- Lawn Maintenance Services, West Chicago
- Lawn Mower Repair & Blade Sharpening Service, West Chicago
- Lawyers & Attorneys, West Chicago
- Legal & Tax Services, West Chicago
- Legal Professionals, West Chicago
- Libraries, West Chicago
- Life Insurance, West Chicago
- Lighting Fixtures & Equipment, West Chicago
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- Limousine Service, West Chicago
- Liquor Stores, West Chicago
- Lithograph Inks Manufacturers, West Chicago
- Lithography Equipment & Supplies, West Chicago
- Live Theaters, West Chicago
- Livestock, West Chicago
- Local & Short Haul Trucking Companies, West Chicago
- Locks, West Chicago
- Locksmiths, West Chicago - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, West Chicago
- Lodging, West Chicago
- Logistics Freight, West Chicago
- Long Haul Trucking Companies, West Chicago
- Lumber & Lumber Products, West Chicago
- Lumber & Lumber Products, West Chicago
- Lumber & Wood Products Manufacturers, West Chicago
- Lumber Companies, West Chicago - Wholesale, Manufacturers & Suppliers
- Lumber Treating & Drying, West Chicago
- Lutheran Church, West Chicago
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