- Machine Shop & Tool Repair Service, Central Islip
- Machinery, Supplies & Equipment - Business Production Related, Central Islip
- Machinery, Supplies & Equipment - Business Supplies Related, Central Islip
- Major Appliances, Central Islip - Household & Kitchen
- Management Consultants & Services, Central Islip
- Manicurists & Pedicurists, Central Islip
- Manufacturing, Central Islip
- Manufacturing & Industrial Consultants, Central Islip
- Marble Tiles, Central Islip
- Marine Products And Services, Central Islip
- Marine Repair & Service Stations, Central Islip
- Marine Supplies & Equipment, Central Islip - Boat Supplies
- Marine Supplies & Equipment Repair, Central Islip - Boat Supplies & Equipment
- Marriage & Family Counselors, Central Islip
- Martial Arts & Self Defense Schools, Central Islip
- Material Handling Equipment, Central Islip - Conveyor Belt, Pallet Jack, Forklift, etc
- Meat Market, Wholesale & Products, Central Islip
- Mechanical Contractors, Central Islip - Install, Service & Repair
- Medical & Health Service Organizations, Central Islip
- Medical Diagnostic Clinics, Central Islip - Clinical Labs & Centers
- Medical Supplies & Equipment, Central Islip
- Mental Health Clinics, Central Islip - Treatment Centers
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- Mental Health Specialists, Central Islip - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Central Islip
- Messenger Service, Central Islip - Message Receiving & Forwarding Service
- Methodist Church, Central Islip
- Mexican Restaurants, Central Islip
- Milk & Milk Products, Central Islip
- Ministries Church, Central Islip
- Miscellaneous Government, Central Islip
- Miscellaneous Personal Services, Central Islip
- Miscellaneous Professional, Central Islip
- Money Transfer Service, Central Islip
- Mortgage Bankers & Correspondents, Central Islip
- Mortgage Companies, Central Islip
- Motion Picture & Television Production Services, Central Islip
- Motor Vehicle, Central Islip
- Motor Vehicle Rental & Leasing, Central Islip
- Motorcycle & Motor Scooters Dealers, Repair & Service, Central Islip
- Motorcycle Repair & Service, Central Islip
- Moving Companies, Central Islip
- Moving Truck Rental , Central Islip
- Muffler Shop & Exhaust Systems, Central Islip
- Museums, Central Islip
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