- Machine Shop & Tool Repair Service, Mayville
- Machinery And Equipment Manufacturers, Mayville
- Machinery, Supplies & Equipment - Business Production Related, Mayville
- Machinery, Supplies & Equipment - Business Supplies Related, Mayville
- Major Appliances, Mayville - Household & Kitchen
- Malls & Shopping Centers, Mayville
- Manicurists & Pedicurists, Mayville
- Manufacturing, Mayville
- Manufacturing Products, Mayville
- Marble, Mayville
- Masonry Contractors, Mayville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Mayville
- Massage Therapists & Professional, Mayville
- Massage Therapy, Mayville
- Material Handling Equipment, Mayville - Conveyor Belt, Pallet Jack, Forklift, etc
- Metal Repair Service & Blacksmith, Mayville - Iron Works
- Metal Specialties, Mayville
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- Metal Stampings Manufacturers, Mayville
- Metal Working Machinery, Mayville
- Methodist Church, Mayville
- Miscellaneous Government, Mayville
- Miscellaneous Metal Work Manufacturers, Mayville
- Miscellaneous Personal Services, Mayville
- Miscellaneous Professional, Mayville
- Monuments, Tombstones, Markers & Memorials, Mayville
- Mortgage Bankers & Correspondents, Mayville
- Motor Vehicle, Mayville
- Motor Vehicle Rental & Leasing, Mayville
- Moving Companies, Mayville
- Moving Supplies & Equipment Rental, Mayville
- Moving Truck Rental , Mayville
- Muffler Shop & Exhaust Systems, Mayville
- Music, Mayville
- Musical Instruments & Equipment Stores, Mayville
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