- Machine Shop & Tool Repair Service, Islip
- Machinery, Supplies & Equipment - Business Production Related, Islip
- Machinery, Supplies & Equipment - Business Supplies Related, Islip
- Machinery, Supplies & Equipment - Construction & Contractor Related, Islip
- Mail Delivery Service, Islip
- Maintenance, Cleaning & Sanitation, Islip
- Major Appliances, Islip - Household & Kitchen
- Make Up & Cosmetics Application, Islip
- Management Consultants & Services, Islip
- Manicurists & Pedicurists, Islip
- Manufacturers Agents & Representatives, Islip
- Manufacturers Representative, Islip - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Islip
- Manufacturing Products, Islip
- Marriage & Family Counselors, Islip
- Masonry Materials & Supplies, Islip
- Massage Therapists & Professional, Islip
- Massage Therapy, Islip
- Meat Market, Wholesale & Products, Islip
- Medical Diagnostic Clinics, Islip - Clinical Labs & Centers
- Medical Supplies & Equipment, Islip
- Membership Sports & Recreation Clubs, Islip
- Mental Health Specialists, Islip - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Boxes & Containers, Islip
- Metal Repair Service & Blacksmith, Islip - Iron Works
- Methodist Church, Islip
- Mexican Restaurants, Islip
- Mildew Removal & Control, Islip - Mold Removal
- Miscellaneous Household Item Repair, Islip
- Miscellaneous Agriculture, Islip
- Miscellaneous Government, Islip
- Miscellaneous Manufacturing, Islip
- Miscellaneous Personal Services, Islip
- Miscellaneous Photographers, Islip
- Miscellaneous Professional, Islip
- Mortgage Bankers & Correspondents, Islip
- Mortgage Brokers, Islip
- Motion Picture Pre & Post Production Services, Islip
- Motor Vehicle, Islip
- Motor Vehicle Rental & Leasing, Islip
- Movie Theaters, Islip
- Moving Companies, Islip
- Moving Truck Rental , Islip
- Multimedia Publishers, Islip - Multimedia Services & Systems
- Musical Instruments Repair, Sales & Service, Islip
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