- Machine Shop, East Islip
- Machinery, Supplies & Equipment - Business Production Related, East Islip
- Machinery, Supplies & Equipment - Business Supplies Related, East Islip
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Islip
- Major Appliances, East Islip - Household & Kitchen
- Management Consultants & Services, East Islip
- Manicurists & Pedicurists, East Islip
- Manufacturing, East Islip
- Marine Products And Services, East Islip
- Marine Services, East Islip
- Market Research & Analysis , East Islip - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, East Islip
- Martial Arts & Self Defense Schools, East Islip
- Masonry Contractors, East Islip - Stone Mason, Brick Mason - Install & Repair
- Meat Market, Wholesale & Products, East Islip
- Medical Equipment & Supplies Rental & Leasing, East Islip
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- Medical Supplies & Equipment, East Islip
- Mental Health Specialists, East Islip - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, East Islip
- Ministries Church, East Islip
- Miscellaneous Household Item Repair, East Islip
- Miscellaneous Government, East Islip
- Miscellaneous Personal Services, East Islip
- Miscellaneous Professional, East Islip
- Mortgage Bankers & Correspondents, East Islip
- Motor Vehicle, East Islip
- Motor Vehicle Rental & Leasing, East Islip
- Motorcycle Parts, Accessories & Dealers, East Islip
- Moving Companies, East Islip
- Moving Supplies & Equipment Rental, East Islip
- Moving Truck Rental , East Islip
- Music, East Islip
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