- Labor Organizations, Romeoville
- Laminating Services, Romeoville
- Land Surveyor, Romeoville - Land Surveying Services
- Landscape Contractors & Designers, Romeoville
- Landscaping, Romeoville
- Lawn & Garden Equipment & Supplies, Romeoville
- Lawn & Garden Services, Romeoville
- Lawn & Garden Sprinkler Systems, Romeoville
- Lawn Maintenance Services, Romeoville
- Lawyers & Attorneys, Romeoville
- Legal & Tax Services, Romeoville
- Legal Professionals, Romeoville
- Libraries, Romeoville
- Life Insurance, Romeoville
- Lighting Fixtures & Equipment, Romeoville
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- Limousine Service, Romeoville
- Liquor Stores, Romeoville
- Lithographic Printing, Romeoville
- Loans Personal, Romeoville
- Local & Short Haul Trucking Companies, Romeoville
- Locks, Romeoville
- Locksmiths, Romeoville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Romeoville
- Lodging, Romeoville
- Lodging Services, Romeoville
- Logistics Freight, Romeoville
- Long Haul Trucking Companies, Romeoville
- Lumber Companies, Romeoville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Romeoville
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