- Machine Shop & Tool Repair Service, East Northport
- Machinery, Supplies & Equipment - Business Production Related, East Northport
- Machinery, Supplies & Equipment - Business Supplies Related, East Northport
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Northport
- Mail Delivery Service, East Northport
- Mailbox Rental Services, East Northport
- Mailing, Delivery & Courier Service, East Northport
- Major Appliances, East Northport - Household & Kitchen
- Malls & Shopping Centers, East Northport
- Management Consultants & Services, East Northport
- Manicurists & Pedicurists, East Northport
- Manufacturers Agents & Representatives, East Northport
- Manufacturing, East Northport
- Manufacturing Equipment & Supplies, East Northport
- Marine Products And Services, East Northport
- Marine Repair & Service Stations, East Northport
- Marine Supplies & Equipment, East Northport - Boat Supplies
- Marine Supplies & Equipment Repair, East Northport - Boat Supplies & Equipment
- Marriage & Family Counselors, East Northport
- Marriage Officiant, East Northport
- Martial Arts & Self Defense Schools, East Northport
- Masonry Contractors, East Northport - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, East Northport
- Massage Therapy, East Northport
- Meat Market, Wholesale & Products, East Northport
- Medical Diagnostic Clinics, East Northport - Clinical Labs & Centers
- Medical Research, East Northport
- Medical Research & Development, East Northport - Medical Information & Research
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- Medical Supplies & Equipment, East Northport
- Membership Sports & Recreation Clubs, East Northport
- Mental Health Specialists, East Northport - Psychologist, Psychiatrist, Psychotherapist, etc
- Messenger Service, East Northport - Message Receiving & Forwarding Service
- Methodist Church, East Northport
- Mexican Restaurants, East Northport
- Mini & Self Storage, East Northport
- Miscellaneous Household Item Repair, East Northport
- Miscellaneous Business Services, East Northport
- Miscellaneous Government, East Northport
- Miscellaneous Manufacturing, East Northport
- Miscellaneous Personal Services, East Northport
- Miscellaneous Photographers, East Northport
- Miscellaneous Professional, East Northport
- Motor Vehicle, East Northport
- Motor Vehicle Rental & Leasing, East Northport
- Motorcycle & Motor Scooters Dealers, Repair & Service, East Northport
- Motorcycle Repair & Service, East Northport
- Moving & Storage Supplies & Equipment, East Northport
- Moving Companies, East Northport
- Moving Supplies & Equipment Rental, East Northport
- Moving Truck Rental , East Northport
- Multimedia Publishers, East Northport - Multimedia Services & Systems
- Music, East Northport
- Music Lessons, East Northport
- Music Lessons - Instrumental, East Northport
- Music Schools, East Northport
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