- Labor Organizations, Madison
- Labor Unions, Madison
- Laboratories Dental, Madison
- Laboratories Medical, Madison
- Ladies Ready To Wear, Madison
- Land Surveyor, Madison - Land Surveying Services
- Landscape Contractors & Designers, Madison
- Landscaping, Madison
- Laundry & Dry Cleaning Equipment & Supplies, Madison - Cleaners & Dryers Sales, Repair, Service & Leasing
- Laundry Equipment Rental & Leasing, Madison
- Lawn & Garden Services, Madison
- Lawn Maintenance Services, Madison
- Lawyers & Attorneys, Madison
- Lead Paint Testing, Detection & Removal, Madison
- Lead Testing, Detection & Removal - Commercial & Industrial, Madison - Lead Paint
- Lead Testing, Detection & Removal - Residential, Madison - Lead Paint
- Legal Professionals, Madison
- Letter Shop & Addressing Services, Madison
- Libraries, Madison
- Licensed Counselors, Madison
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- Life Insurance, Madison
- Lighting Fixtures & Equipment, Madison
- Linen Supply Services, Madison
- Linens, Madison
- Lingerie & Underwear for Women, Madison - Bras, Panties, Bustiers, Corsets & More
- Livestock, Madison
- Livestock Equipment & Supplies, 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
- Long Haul Trucking Companies, Madison
- Lubricating Oils , Madison - Motor Oil
- Lumber & Lumber Products, Madison
- Lumber & Lumber Products, Madison
- Lutheran Church, Madison
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