- Labor & Employment Consultants, Belvidere
- Labor Organizations, Belvidere
- Laboratories Medical, Belvidere
- Land Surveyor, Belvidere - Land Surveying Services
- Landscape Contractors & Designers, Belvidere
- Landscaping, Belvidere
- Landscaping Materials & Supplies, Belvidere
- Laundry Self Service, Belvidere
- Lawn & Garden Equipment & Supplies, Belvidere
- Lawn & Garden Services, Belvidere
- Lawn & Yard, Belvidere
- Lawn Maintenance Services, Belvidere
- Lawn Mower Repair & Blade Sharpening Service, Belvidere
- Lawn Mowers & Power Equipment, Belvidere
- Lawyers & Attorneys, Belvidere
- Legal Professionals, Belvidere
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- Libraries, Belvidere
- License Services, Belvidere
- Lighting Fixtures & Equipment, Belvidere
- Limousine Service, Belvidere
- Liquor Stores, Belvidere
- Loans Check Cashing, Belvidere
- Loans Personal, Belvidere
- Local & Short Haul Trucking Companies, Belvidere
- Locks, Belvidere
- Locksmiths, Belvidere - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Belvidere
- Lodging, Belvidere
- Lodging Services, Belvidere
- Long Haul Trucking Companies, Belvidere
- Lumber Companies, Belvidere - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Belvidere
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