- Machine Shop & Tool Repair Service, Madison
- Machinery, Supplies & Equipment - Business Supplies Related, Madison
- Machinery, Supplies & Equipment - Construction & Contractor Related, Madison
- Major Appliances, Madison - Household & Kitchen
- Manufacturing, Madison
- Marriage & Family Counselors, Madison
- Medical Supplies & Equipment, Madison
- Mental Health Specialists, Madison - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Business Services, Madison
- Miscellaneous Government, Madison
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- Miscellaneous Photographers, Madison
- Monuments, Tombstones, Markers & Memorials, Madison
- Mortgage Bankers & Correspondents, Madison
- Mortgage Contracts & Services, Madison
- Motor Vehicle, Madison
- Motor Vehicle Rental & Leasing, Madison
- Movie Theaters, Madison
- Moving Truck Rental , Madison
- Museums, Madison
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