- Machinery, Supplies & Equipment - Business Production Related, Piedmont
- Machinery, Supplies & Equipment - Business Supplies Related, Piedmont
- Management Consultants & Services, Piedmont
- Manicurists & Pedicurists, Piedmont
- Manufacturing, Piedmont
- Marine Cargo Handling, Piedmont
- Marriage & Family Counselors, Piedmont
- Masonry Materials & Supplies, Piedmont
- Men's Clothing Stores, Piedmont - Clothes & Accessories
- Mental Health Specialists, Piedmont - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Piedmont
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- Mexican Restaurants, Piedmont
- Ministries Church, Piedmont
- Miscellaneous Agriculture, Piedmont
- Miscellaneous Government, Piedmont
- Mission Churches, Piedmont
- Monuments, Tombstones, Markers & Memorials, Piedmont
- Motor Vehicle, Piedmont
- Motor Vehicle Rental & Leasing, Piedmont
- Movie Theaters, Piedmont
- Moving Truck Rental , Piedmont
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