- Machine Shop, Piedmont
- Machine Shop & Tool Repair Service, Piedmont
- Machinery, Supplies & Equipment - Business Production Related, Piedmont
- Machinery, Supplies & Equipment - Construction & Contractor Related, Piedmont
- Management Consultants & Services, Piedmont
- Manufacturing, Piedmont
- Masonry Materials & Supplies, Piedmont
- Mental Health Clinics, Piedmont - Treatment Centers
- Metal Buildings, Piedmont - Wood Buildings
- Metal Buildings, Piedmont - Kits, Homes, Steel Buildings, etc
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- Methodist Church, Piedmont
- Mexican Restaurants, Piedmont
- Miscellaneous Agriculture, Piedmont
- Miscellaneous Government, Piedmont
- Miscellaneous Professional, Piedmont
- Mortgage Bankers & Correspondents, Piedmont
- Motor Vehicle, Piedmont
- Motor Vehicle Rental & Leasing, Piedmont
- Moving Truck Rental , Piedmont
- Murals & Faux Finish Walls, Piedmont
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