- Machinery, Supplies & Equipment - Business Supplies Related, Miller Place
- Machinery, Supplies & Equipment - Construction & Contractor Related, Miller Place
- Major Appliances, Miller Place - Household & Kitchen
- Management Consultants & Services, Miller Place
- Manicurists & Pedicurists, Miller Place
- Manufacturing, Miller Place
- Manufacturing & Industrial Consultants, Miller Place
- Marine Products And Services, Miller Place
- Marine Repair & Service Stations, Miller Place
- Marine Supplies & Equipment Repair, Miller Place - Boat Supplies & Equipment
- Marriage & Family Counselors, Miller Place
- Martial Arts & Self Defense Schools, Miller Place
- Masonry Contractors, Miller Place - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Miller Place
- Medical Diagnostic Clinics, Miller Place - Clinical Labs & Centers
- Medical Records Service , Miller Place
- Medical Supplies & Equipment, Miller Place
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- Mental Health Specialists, Miller Place - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Miller Place - Iron Works
- Mini & Self Storage, Miller Place
- Miscellaneous Agriculture, Miller Place
- Miscellaneous Government, Miller Place
- Miscellaneous Personal Services, Miller Place
- Miscellaneous Photographers, Miller Place
- Miscellaneous Professional, Miller Place
- Mortgage Bankers & Correspondents, Miller Place
- Motor Vehicle, Miller Place
- Motor Vehicle Rental & Leasing, Miller Place
- Music, Miller Place
- Music Lessons, Miller Place
- Music Lessons - Instrumental, Miller Place
- Musical Instrument Rental, Miller Place - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Miller Place
- Musical Recording Services, Miller Place
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