- Machine Shop & Tool Repair Service, Shelbyville
- Machinery, Supplies & Equipment - Business Production Related, Shelbyville
- Machinery, Supplies & Equipment - Business Supplies Related, Shelbyville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Shelbyville
- Maintenance, Cleaning & Sanitation, Shelbyville
- Major Appliances, Shelbyville - Household & Kitchen
- Manicurists & Pedicurists, Shelbyville
- Manufacturing, Shelbyville
- Marinas & Marina Services, Shelbyville
- Marriage & Family Counselors, Shelbyville
- Martial Arts & Self Defense Schools, Shelbyville
- Masonry Contractors, Shelbyville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Shelbyville
- Meat Market, Wholesale & Products, Shelbyville
- Medical & Health Service Organizations, Shelbyville
- Mental Health Specialists, Shelbyville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Shelbyville
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- Methodist Church, Shelbyville
- Mexican Restaurants, Shelbyville
- Mildew Removal & Control, Shelbyville - Mold Removal
- Mini & Self Storage, Shelbyville
- Miscellaneous Business Product Repair, Shelbyville
- Miscellaneous Government, Shelbyville
- Miscellaneous Personal Services, Shelbyville
- Miscellaneous Professional, Shelbyville
- Monuments, Tombstones, Markers & Memorials, Shelbyville
- Mortgage Bankers & Correspondents, Shelbyville
- Motor Vehicle, Shelbyville
- Motor Vehicle Rental & Leasing, Shelbyville
- Motorcycle Parts, Accessories & Dealers, Shelbyville
- Movie Theaters, Shelbyville
- Moving Supplies & Equipment Rental, Shelbyville
- Moving Truck Rental , Shelbyville
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