- Machinery, Supplies & Equipment - Business Production Related, West Islip
- Management Consultants & Services, West Islip
- Manicurists & Pedicurists, West Islip
- Manufacturing, West Islip
- Manufacturing & Industrial Consultants, West Islip
- Marine Contractors & Designers, West Islip
- Marine Products And Services, West Islip
- Marine Repair & Service Stations, West Islip
- Marine Supplies & Equipment, West Islip - Boat Supplies
- Marine Supplies & Equipment Repair, West Islip - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, West Islip
- Martial Arts & Self Defense Schools, West Islip
- Masonry Contractors, West Islip - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, West Islip
- Massage Therapy, West Islip
- Meat Market, Wholesale & Products, West Islip
- Mechanical Contractors, West Islip - Install, Service & Repair
- Medical Billing Services, West Islip
- Medical Supplies & Equipment, West Islip
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- Membership Sports & Recreation Clubs, West Islip
- Men's Clothing Stores, West Islip - Clothes & Accessories
- Mental Health Specialists, West Islip - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, West Islip - Iron Works
- Miscellaneous Business Services, West Islip
- Miscellaneous Government, West Islip
- Miscellaneous Personal Services, West Islip
- Miscellaneous Professional, West Islip
- Mortgage Bankers & Correspondents, West Islip
- Motion Picture & Television Production Services, West Islip
- Motion Picture Pre & Post Production Services, West Islip
- Motor Vehicle, West Islip
- Motor Vehicle Rental & Leasing, West Islip
- Moving & Storage Supplies & Equipment, West Islip
- Moving Companies, West Islip
- Moving Supplies & Equipment Rental, West Islip
- Moving Truck Rental , West Islip
- Music Publishers & Distribution, West Islip
- Music Writers Supplies, West Islip
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