- 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
- Management Consultants & Services, Shelbyville
- Manicurists & Pedicurists, Shelbyville
- Manufacturing, Shelbyville
- Manufacturing Equipment & Supplies, Shelbyville
- Manufacturing Products, Shelbyville
- Marriage & Family Counselors, Shelbyville
- Martial Arts & Self Defense Schools, Shelbyville
- Masonry Materials & Supplies, Shelbyville
- Mats & Matting, Shelbyville
- Medical & Dental Management, Shelbyville
- Medical & Health Service Organizations, Shelbyville
- Medical Billing Services, Shelbyville
- Medical Claims Processing & Assistance, Shelbyville
- Medical Management & Business Administration Service, Shelbyville
- Medical Supplies & Equipment, Shelbyville
- Membership Sports & Recreation Clubs, Shelbyville
- Mental Health Clinics, Shelbyville - Treatment Centers
- Mental Health Specialists, Shelbyville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Shelbyville
- Merle Norman Cosmetics, Shelbyville
- Metal Buildings, Shelbyville - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Shelbyville
- Mexican Restaurants, Shelbyville
- Mildew Removal & Control, Shelbyville - Mold Removal
- Miscellaneous Business Credit Institutions & Services, Shelbyville
- Miscellaneous Household Item Repair, Shelbyville
- Miscellaneous Business Services, Shelbyville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Shelbyville
- Miscellaneous Government, Shelbyville
- Miscellaneous Industry, Shelbyville
- Miscellaneous Manufacturing, Shelbyville
- Miscellaneous Personal Services, Shelbyville
- Miscellaneous Professional, Shelbyville
- Mission Churches, Shelbyville
- Mobile Home Parks & Communities , Shelbyville
- Monuments, Tombstones, Markers & Memorials, Shelbyville
- Mortgage Bankers & Correspondents, Shelbyville
- Mortgages & Loans, Shelbyville
- Motor Vehicle, Shelbyville
- Motor Vehicle Rental & Leasing, Shelbyville
- Motorcycle Parts, Accessories & Dealers, Shelbyville
- Moving & Storage Supplies & Equipment, Shelbyville
- Moving Companies, Shelbyville
- Moving Truck Rental , Shelbyville
- Mulch, Peat & Moss Products, Shelbyville
- Music, Shelbyville
- Musical Instruments & Equipment Stores, Shelbyville
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