- Machine Shop, Mayville
- Machine Shop & Tool Repair Service, Mayville
- Manholes & Manhole Covers Manufacturers, Mayville
- Manufacturing, Mayville
- Manufacturing Products, Mayville
- Marinas & Marina Services, Mayville
- Marine Supplies & Equipment, Mayville - Boat Supplies
- Masonry Contractors, Mayville - Stone Mason, Brick Mason - Install & Repair
- Membership Sports & Recreation Clubs, Mayville
- Methodist Church, Mayville
- Mini & Self Storage, Mayville
- Miscellaneous Government, Mayville
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- Miscellaneous Personal Services, Mayville
- Miscellaneous Photographers, Mayville
- Miscellaneous Professional, Mayville
- Mobile Communications 2 Way Radios Sales & Service, Mayville
- Mobile Home Parks & Communities , Mayville
- Mortgage Bankers & Correspondents, Mayville
- Mortgage Contracts & Services, Mayville
- Mortgages & Loans, Mayville
- Motor Vehicle, Mayville
- Motor Vehicle Rental & Leasing, Mayville
- Motorcycle Parts, Accessories & Dealers, Mayville
- Moving Truck Rental , Mayville
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