- Labor & Employment Consultants, Madison
- Laboratories Dental, Madison
- Laboratories Medical, Madison
- Land Surveyor, Madison - Land Surveying Services
- Landscape Contractors & Designers, Madison
- Landscaping, Madison
- Late Night Restaurants, Madison
- Laundry Self Service, Madison
- Lawn & Garden Services, Madison
- Lawn Maintenance Services, Madison
- Lawn Mower Repair & Blade Sharpening Service, Madison
- Lawyers & Attorneys, Madison
- Legal & Tax Services, Madison
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- Legal Professionals, Madison
- Licensed Counselors, Madison
- Lighting Fixtures & Equipment, Madison
- Limousine Service, Madison
- Liquor Stores, Madison
- Live Theaters, Madison
- Loans Personal, Madison
- Locksmiths, Madison - Residence, Commercial, Safe & Auto Car Locksmith
- Lodging, Madison
- Long Haul Trucking Companies, Madison
- Lumber & Lumber Products, Madison
- Lumber & Lumber Products, Madison
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