- Laboratories Dental, Blue Island
- Laboratories Medical, Blue Island
- Landscape Contractors & Designers, Blue Island
- Landscaping, Blue Island
- Landscaping Materials & Supplies, Blue Island
- Late Night Restaurants, Blue Island
- Laundry Self Service, Blue Island
- Lawn & Garden Services, Blue Island
- Lawn Maintenance Services, Blue Island
- Lawyers & Attorneys, Blue Island
- Legal & Tax Services, Blue Island
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- Legal Professionals, Blue Island
- Limousine Service, Blue Island
- Linen Supply Services, Blue Island
- Liquor Stores, Blue Island
- Loans Personal, Blue Island
- Loans Title Services, Blue Island
- Locksmiths, Blue Island - Residence, Commercial, Safe & Auto Car Locksmith
- Long Haul Trucking Companies, Blue Island
- Lumber Companies, Blue Island - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Blue Island
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