- Machine Shop & Tool Repair Service, East Setauket
- Machinery, Supplies & Equipment - Business Production Related, East Setauket
- Machinery, Supplies & Equipment - Business Supplies Related, East Setauket
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Setauket
- Magnetic Devices, East Setauket
- Magnets & Magnetic Devices, East Setauket
- Major Appliances, East Setauket - Household & Kitchen
- Management Consultants & Services, East Setauket
- Manicurists & Pedicurists, East Setauket
- Manufacturers Agents & Representatives, East Setauket
- Manufacturers Representative, East Setauket - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, East Setauket
- Manufacturing Products, East Setauket
- Marriage & Family Counselors, East Setauket
- Martial Arts & Self Defense Schools, East Setauket
- Massage Therapists & Professional, East Setauket
- Massage Therapy, East Setauket
- Meat Market, Wholesale & Products, East Setauket
- Medical & Health Service Organizations, East Setauket
- Medical Diagnostic Clinics, East Setauket - Clinical Labs & Centers
- Medical Supplies & Equipment, East Setauket
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- Membership Sports & Recreation Clubs, East Setauket
- Mental Health Specialists, East Setauket - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, East Setauket - Kits, Homes, Steel Buildings, etc
- Metaphysical Churches, East Setauket
- Middle Eastern Restaurants, East Setauket
- Miscellaneous Agriculture, East Setauket
- Miscellaneous Manufacturing, East Setauket
- Miscellaneous Personal Services, East Setauket
- Miscellaneous Photographers, East Setauket
- Miscellaneous Professional, East Setauket
- Mortgage Bankers & Correspondents, East Setauket
- Motor Vehicle, East Setauket
- Motor Vehicle Rental & Leasing, East Setauket
- Moving Companies, East Setauket
- Moving Truck Rental , East Setauket
- Museums, East Setauket
- Music, East Setauket
- Music Lessons, East Setauket
- Music Lessons - Vocal, East Setauket
- Musical Instrument Rental, East Setauket - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, East Setauket
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