- Laboratories Dental, Madison
- Laboratories Medical, Madison
- Land Surveyor, Madison - Land Surveying Services
- Landscape Contractors & Designers, Madison
- Landscape Garden Services, Madison
- Landscaping, Madison
- Late Night Restaurants, Madison
- Laundromats & Dry-Cleaning, Coin-Operated, Madison
- Laundry Equipment Rental & Leasing, Madison
- Lawn & Garden Equipment & Supplies, Madison
- Lawn & Garden Services, Madison
- Lawn & Garden Sprinkler Systems, Madison
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- Lawn Mowers & Power Equipment, Madison
- Lawyers & Attorneys, Madison
- Legal Professionals, Madison
- Libraries, Madison
- License Services, Madison
- Liquor Stores, Madison
- Locks, Madison
- Locksmiths, Madison - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Madison
- Lodging, Madison
- Long Haul Trucking Companies, Madison
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