- Machine Shop & Tool Repair Service, Shelby
- Machinery Installation Equipment & Supplies, Shelby
- Machinery, Supplies & Equipment - Business Supplies Related, Shelby
- Machinery, Supplies & Equipment - Construction & Contractor Related, Shelby
- Management Consultants & Services, Shelby
- Manufacturing, Shelby
- Manufacturing Products, Shelby
- Marketing Consultants Professional Practices, Shelby
- Masonry Materials & Supplies, Shelby
- Material Handling & Heavy Machinery & Equipment, Shelby
- Medical Diagnostic Clinics, Shelby - Clinical Labs & Centers
- Medical Supplies & Equipment, Shelby
- Meeting & Event Planning Services, Shelby - Conference Consultants
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- Membership Sports & Recreation Clubs, Shelby
- Metal Stampings Manufacturers, Shelby
- Methodist Church, Shelby
- Mexican Restaurants, Shelby
- Miscellaneous Agriculture, Shelby
- Miscellaneous Government, Shelby
- Miscellaneous Industry, Shelby
- Miscellaneous Metal Work Manufacturers, Shelby
- Miscellaneous Personal Services, Shelby
- Motor Vehicle, Shelby
- Motor Vehicle Rental & Leasing, Shelby
- Moving Truck Rental , Shelby
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