- Labor Organizations, Rockford
- Ladder & Lift Equipment & Machine Rental, Rockford
- Lamp Shades, Rockford
- Lamps & Lamp Shades Retail, Rockford - Desk, Table & Floor Lamps
- Land Surveyor, Rockford - Land Surveying Services
- Landscape Contractors & Designers, Rockford
- Landscaping, Rockford
- Landscaping Materials & Supplies, Rockford
- Laser Hair Removal, Rockford
- Late Night Restaurants, Rockford
- Laundry Self Service, Rockford
- Lawn & Garden Equipment & Supplies, Rockford
- Lawn & Garden Services, Rockford
- Lawn & Garden Sprinkler Systems, Rockford
- Lawn Maintenance Services, Rockford
- Lawyers & Attorneys, Rockford
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- Legal Professionals, Rockford
- Libraries, Rockford
- Life Insurance, Rockford
- Liquor Stores, Rockford
- Livestock, Rockford
- Loans Personal, Rockford
- Locks, Rockford
- Locksmiths, Rockford - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Rockford
- Lodging, Rockford
- Long Haul Trucking Companies, Rockford
- Long Term Care Facility, Rockford
- Luggage & Accessories , Rockford
- Lumber Companies, Rockford - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Rockford
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