- Machinery, Supplies & Equipment - Construction & Contractor Related, Mount Vernon
- Manufacturing, Mount Vernon
- Manufacturing Products, Mount Vernon
- Marriage & Family Counselors, Mount Vernon
- Masonry Materials & Supplies, Mount Vernon
- Massage Therapy, Mount Vernon
- Medical Supplies & Equipment, Mount Vernon
- Men's & Boys Clothing & Accessories Stores, Mount Vernon
- Mens & Boys Belts & Suspenders, Mount Vernon
- Mental Health Specialists, Mount Vernon - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Mount Vernon
- Metal Repair Service & Blacksmith, Mount Vernon - Iron Works
- Methodist Church, Mount Vernon
- Miscellaneous Government, Mount Vernon
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- Miscellaneous Personal Services, Mount Vernon
- Miscellaneous Photographers, Mount Vernon
- Miscellaneous Professional, Mount Vernon
- Mortgage Bankers & Correspondents, Mount Vernon
- Mortgage Contracts & Services, Mount Vernon
- Motion Picture Pre & Post Production Services, Mount Vernon
- Motor Vehicle, Mount Vernon
- Movie Theaters, Mount Vernon
- Music, Mount Vernon
- Music Schools, Mount Vernon
- Musical Instrument Rental, Mount Vernon - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Mount Vernon
- Musical Recording Services, Mount Vernon
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