- Machine Shop, Leonardtown
- Machine Shop & Tool Repair Service, Leonardtown
- Machinery, Supplies & Equipment - Business Production Related, Leonardtown
- Machinery, Supplies & Equipment - Business Supplies Related, Leonardtown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Leonardtown
- Major Appliances, Leonardtown - Household & Kitchen
- Management Consultants & Services, Leonardtown
- Manicurists & Pedicurists, Leonardtown
- Manufactured & Mobile Home Movers & Transporting, Leonardtown
- Manufacturing, Leonardtown
- Marinas & Marina Services, Leonardtown
- Marriage & Family Counselors, Leonardtown
- Martial Arts & Self Defense Schools, Leonardtown
- Masonry Contractors, Leonardtown - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Leonardtown
- Material Handling & Heavy Machinery & Equipment, Leonardtown
- Material Handling Equipment, Leonardtown - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Dental Management, Leonardtown
- Medical Diagnostic Clinics, Leonardtown - Clinical Labs & Centers
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- Medical Supplies & Equipment, Leonardtown
- Membership Sports & Recreation Clubs, Leonardtown
- Mental Health Specialists, Leonardtown - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Leonardtown
- Mexican Restaurants, Leonardtown
- Midwives, Leonardtown
- Mining, Leonardtown
- Miscellaneous Government, Leonardtown
- Miscellaneous Personal Services, Leonardtown
- Miscellaneous Professional, Leonardtown
- Monuments, Tombstones, Markers & Memorials, Leonardtown
- Mortgage Bankers & Correspondents, Leonardtown
- Mortgage Contracts & Services, Leonardtown
- Motor Vehicle, Leonardtown
- Motor Vehicle Rental & Leasing, Leonardtown
- Moving Truck Rental , Leonardtown
- Museums, Leonardtown
- Music, Leonardtown
- Musical Instrument Rental, Leonardtown - Band & Orchestra Instruments
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