- Landscape Contractors & Designers, Platteville
- Landscaping, Platteville
- Late Night Restaurants, Platteville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Platteville
- Lawn & Garden Equipment & Supplies, Platteville
- Lawn & Garden Services, Platteville
- Lawn & Tree Service, Platteville
- Lawn & Yard, Platteville
- Lawn Maintenance Services, Platteville
- Lawn Mower Repair & Blade Sharpening Service, Platteville
- Lawn Mowers & Power Equipment, Platteville
- Lawn Mowers Sharpening Equipment, Platteville
- Lawyers & Attorneys, Platteville
- Legal Professionals, Platteville
- Life Insurance, Platteville
- Lime & Limestone, Platteville
- Limestone Crushed, Platteville
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- Liquor Stores, Platteville
- Livestock, Platteville
- Livestock Dealers, Platteville
- Livestock Services, Platteville
- Livestock Trailers, Platteville
- Loans Check Cashing, Platteville
- Loans Personal, Platteville
- Local & Short Haul Trucking Companies, Platteville
- Locks, Platteville
- Locksmiths, Platteville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Platteville
- Lodging, Platteville
- Lodging Services, Platteville
- Long Haul Trucking Companies, Platteville
- Lumber & Lumber Products, Platteville
- Lumber & Lumber Products, Platteville
- Lutheran Church, Platteville
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