- Labor And Employment Relations Attorneys & Lawyers, Mayville
- Labor And Employment Relations Lawyers & Attorneys, Mayville
- Lawn & Garden Chemicals, Insecticides & Fertilizers, Mayville
- Lawyers & Attorneys, Mayville
- Legal Professionals, Mayville
- Lime & Limestone, Mayville
- Liquor Stores, Mayville
- Livestock, Mayville
- Loans Personal, Mayville
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- Local & Short Haul Trucking Companies, Mayville
- Locks, Mayville
- Locksmiths, Mayville - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Mayville
- Lodging, Mayville
- Long Haul Trucking Companies, Mayville
- Lumber Companies, Mayville - Wholesale, Manufacturers & Suppliers
- Lutheran Church, Mayville
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