- Machine Tools Manufacturers Metal Cutting Types, Northport
- Machinery And Equipment Manufacturers, Northport
- Machinery, Supplies & Equipment - Business Production Related, Northport
- Machinery, Supplies & Equipment - Business Supplies Related, Northport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Northport
- Mail Delivery Service, Northport
- Mailbox Rental Services, Northport
- Mailing, Delivery & Courier Service, Northport
- Major Appliances, Northport - Household & Kitchen
- Management Consultants & Services, Northport
- Manicurists & Pedicurists, Northport
- Manufacturing, Northport
- Manufacturing Products, Northport
- Marble Contractors, Northport - Installation, Cleaning & Removal Services
- Marinas & Marina Services, Northport
- Marine Contractors & Designers, Northport
- Marine Products And Services, Northport
- Marine Repair & Service Stations, Northport
- Marine Supplies & Equipment, Northport - Boat Supplies
- Marine Supplies & Equipment Repair, Northport - Boat Supplies & Equipment
- Marionettes & Puppets, Northport
- Marriage & Family Counselors, Northport
- Martial Arts & Self Defense Schools, Northport
- Masonry Contractors, Northport - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Northport
- Massage Therapy, Northport
- Massage Therapy Relaxation, Northport
- Meat Market, Wholesale & Products, Northport
- Medical Diagnostic Clinics, Northport - Clinical Labs & Centers
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- Medical Supplies & Equipment, Northport
- Medical Transcription Service, Northport
- Membership Sports & Recreation Clubs, Northport
- Mental Health Specialists, Northport - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Northport
- Methodist Church, Northport
- Mexican Restaurants, Northport
- Milk & Milk Products, Northport
- Mind-Body Massage, Northport
- Mini & Self Storage, Northport
- Miscellaneous Business Services, Northport
- Miscellaneous Government, Northport
- Miscellaneous Industry, Northport
- Miscellaneous Personal Services, Northport
- Miscellaneous Professional, Northport
- Mortgage Bankers & Correspondents, Northport
- Motion Picture Pre & Post Production Services, Northport
- Motor Vehicle, Northport
- Motor Vehicle Rental & Leasing, Northport
- Moving & Storage Supplies & Equipment, Northport
- Moving Companies, Northport
- Moving Services - Labor & Material, Northport
- Multimedia Publishers, Northport - Multimedia Services & Systems
- Museums, Northport
- Music, Northport
- Music Lessons, Northport
- Music Lessons - Instrumental, Northport
- Musical Recording Services, Northport
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