- Machine Shop & Tool Repair Service, Greendale
- Machinery, Supplies & Equipment - Business Supplies Related, Greendale
- Management Consultants & Services, Greendale
- Manufacturing, Greendale
- Martial Arts & Self Defense Schools, Greendale
- Masonry Contractors, Greendale - Stone Mason, Brick Mason - Install & Repair
- Mental Health Specialists, Greendale - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Detecting Equipment, Greendale
- Mini & Self Storage, Greendale
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- Miscellaneous Government, Greendale
- Miscellaneous Personal Services, Greendale
- Monuments, Tombstones, Markers & Memorials, Greendale
- Mortgage Bankers & Correspondents, Greendale
- Mortgages & Loans, Greendale
- Motor Vehicle, Greendale
- Motor Vehicle Rental & Leasing, Greendale
- Moving Companies, Greendale
- Moving Truck Rental , Greendale
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