- Labor Organizations, Madison
- Laboratories Dental, Madison
- Laboratories Medical, Madison
- Land Surveyor, Madison - Land Surveying Services
- Landscape Contractors & Designers, Madison
- Landscape Lighting, Madison
- Landscaping, Madison
- Landscaping Materials & Supplies, Madison
- Laser Printers, Madison - Office Supplies
- Late Night Restaurants, Madison
- Lawn & Garden Equipment & Supplies, Madison
- Lawn & Garden Services, Madison
- Lawn & Garden Sprinkler Systems, Madison
- Lawn Maintenance Services, Madison
- Lawn Mowers & Power Equipment, Madison
- Lawyers & Attorneys, Madison
- Lead Testing, Detection & Removal - Commercial & Industrial, Madison - Lead Paint
- Lead Testing, Detection & Removal - Residential, Madison - Lead Paint
- Legal & Tax Services, Madison
- Legal Professionals, Madison
- Libraries, Madison
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- Licensed Counselors, Madison
- Life Insurance, Madison
- Lighting Fixtures & Equipment, Madison
- Limousine Service, Madison
- Liposuction Surgeons, Madison - Doctors, Physicians & Surgeons
- Liquor Stores, Madison
- Loading Dock Equipment, Madison
- Loans Check Cashing, Madison
- Loans Personal, Madison
- Loans Title Services, Madison
- Locks, Madison
- Locksmiths, Madison - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Madison
- Lodging, Madison
- Lodging Services, Madison
- Long Haul Trucking Companies, Madison
- Lumber & Lumber Products, Madison
- Lumber & Lumber Products, Madison
- Lumber Companies, Madison - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Madison
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