- Machine Shop & Tool Repair Service, Port Jefferson Station
- Machinery, Supplies & Equipment - Business Supplies Related, Port Jefferson Station
- Machinery, Supplies & Equipment - Construction & Contractor Related, Port Jefferson Station
- Magicians & Jugglers Equipment & Supplies, Port Jefferson Station
- Major Appliances, Port Jefferson Station - Household & Kitchen
- Management Consultants & Services, Port Jefferson Station
- Manicurists & Pedicurists, Port Jefferson Station
- Manufacturers Agents & Representatives, Port Jefferson Station
- Manufacturers Representative, Port Jefferson Station - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Port Jefferson Station
- Manufacturing Products, Port Jefferson Station
- Marine Electronic Equipment, Port Jefferson Station
- Marine Products And Services, Port Jefferson Station
- Marine Repair & Service Stations, Port Jefferson Station
- Marine Services, Port Jefferson Station
- Marine Supplies & Equipment, Port Jefferson Station - Boat Supplies
- Marine Supplies & Equipment Repair, Port Jefferson Station - Boat Supplies & Equipment
- Marriage & Family Counselors, Port Jefferson Station
- Martial Arts & Self Defense Schools, Port Jefferson Station
- Masonry Contractors, Port Jefferson Station - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Port Jefferson Station
- Massage Therapy, Port Jefferson Station
- Meat Market, Wholesale & Products, Port Jefferson Station
- Medical & Health Service Organizations, Port Jefferson Station
- Medical Billing Services, Port Jefferson Station
- Medical Diagnostic Clinics, Port Jefferson Station - Clinical Labs & Centers
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- Medical Supplies & Equipment, Port Jefferson Station
- Mental Health Specialists, Port Jefferson Station - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Specialties, Port Jefferson Station
- Methodist Church, Port Jefferson Station
- Mexican Restaurants, Port Jefferson Station
- Miscellaneous Agriculture, Port Jefferson Station
- Miscellaneous Government, Port Jefferson Station
- Miscellaneous Manufacturing, Port Jefferson Station
- Miscellaneous Personal Services, Port Jefferson Station
- Miscellaneous Photographers, Port Jefferson Station
- Miscellaneous Professional, Port Jefferson Station
- Mortgage Bankers & Correspondents, Port Jefferson Station
- Motion Picture Pre & Post Production Services, Port Jefferson Station
- Motor Vehicle, Port Jefferson Station
- Motor Vehicle Rental & Leasing, Port Jefferson Station
- Motorcycle Repair & Service, Port Jefferson Station
- Motorcycles Paint & Refinishing, Port Jefferson Station
- Movie Theaters, Port Jefferson Station
- Moving Companies, Port Jefferson Station
- Moving Truck Rental , Port Jefferson Station
- Muffler Shop & Exhaust Systems, Port Jefferson Station
- Music, Port Jefferson Station
- Music Lessons, Port Jefferson Station
- Music Lessons - Instrumental, Port Jefferson Station
- Musical Instrument Rental, Port Jefferson Station - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Port Jefferson Station
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