- Machinery, Supplies & Equipment - Business Supplies Related, Plains
- Machinery, Supplies & Equipment - Construction & Contractor Related, Plains
- Manufacturing, Plains
- Manufacturing Products, Plains
- Mental Health Specialists, Plains - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Plains - Iron Works
- Methodist Church, Plains
- Mining, Plains
- Miscellaneous Government, Plains
- Miscellaneous Personal Services, Plains
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- Miscellaneous Professional, Plains
- Monuments, Tombstones, Markers & Memorials, Plains
- Mortgage Bankers & Correspondents, Plains
- Mortgages & Loans, Plains
- Motor Vehicle, Plains
- Motor Vehicle Rental & Leasing, Plains
- Moving Supplies & Equipment Rental, Plains
- Moving Truck Rental , Plains
- Music Entertainment, Plains
- Musicians, Bands & Disc Jockeys, Plains
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