- Machine Shop & Tool Repair Service, Shelbyville
- Machinery And Equipment Manufacturers, Shelbyville
- Machinery Repair & Rebuild, Shelbyville
- Machinery, Supplies & Equipment - Business Production Related, Shelbyville
- Machinery, Supplies & Equipment - Business Supplies Related, Shelbyville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Shelbyville
- Major Appliances, Shelbyville - Household & Kitchen
- Mammography Clinics, Shelbyville - Breast Cancer Screening
- Management Consultants & Services, Shelbyville
- Manicurists & Pedicurists, Shelbyville
- Manufacturers Agents & Representatives, Shelbyville
- Manufacturers Representative, Shelbyville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Shelbyville
- Manufacturing & Industrial Consultants, Shelbyville
- Manufacturing Products, Shelbyville
- Manufacturing Services, Shelbyville
- Martial Arts & Self Defense Schools, Shelbyville
- Mary Kay Cosmetics, Shelbyville
- Masonry Materials & Supplies, Shelbyville
- Massage Therapy, Shelbyville
- Mats & Matting, Shelbyville
- Meat Packers, Shelbyville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Shelbyville
- Medical Groups & Clinics, Shelbyville - Medical & Health Centers
- Medical Supplies & Equipment, Shelbyville
- Membership Sports & Recreation Clubs, Shelbyville
- Mental Health Specialists, Shelbyville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Shelbyville
- Merle Norman Cosmetics, Shelbyville
- Metal Buildings, Shelbyville - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Shelbyville
- Metal Heat Treating, Shelbyville
- Metal Plating & Polishing, Shelbyville
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- Metal Repair Service & Blacksmith, Shelbyville - Iron Works
- Metal Stampings Manufacturers, Shelbyville
- Metal Working Machinery, Shelbyville
- Methodist Church, Shelbyville
- Mexican Restaurants, Shelbyville
- Mini & Self Storage, Shelbyville
- Miscellaneous Agriculture, Shelbyville
- Miscellaneous Business Services, Shelbyville
- Miscellaneous Government, Shelbyville
- Miscellaneous Industry, Shelbyville
- Miscellaneous Manufacturing, Shelbyville
- Miscellaneous Metal Work Manufacturers, Shelbyville
- Miscellaneous Personal Services, Shelbyville
- Miscellaneous Photographers, Shelbyville
- Miscellaneous Professional, Shelbyville
- Mobile Home Parks & Communities , Shelbyville
- Modular & Mobile Homes For Sale, Shelbyville - Manufactured Homes Sale & Service
- Molds, Shelbyville
- Money Transfer Service, Shelbyville
- Monuments, Tombstones, Markers & Memorials, Shelbyville
- Mortgage Bankers & Correspondents, Shelbyville
- Motion Picture & Television Production Services, Shelbyville
- Motion Picture Pre & Post Production Services, Shelbyville
- Motor Vehicle, Shelbyville
- Motor Vehicle Rental & Leasing, Shelbyville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Shelbyville
- Motorcycle Parts, Accessories & Dealers, Shelbyville
- Motorcycle Repair & Service, Shelbyville
- Movie Theaters, Shelbyville
- Moving Truck Rental , Shelbyville
- Muffler Shop & Exhaust Systems, Shelbyville
- Music, Shelbyville
- Musical Instruments & Equipment Stores, Shelbyville
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