- Machine Shop & Tool Repair Service, East Hampton
- Machinery, Supplies & Equipment - Business Supplies Related, East Hampton
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Hampton
- Manicurists & Pedicurists, East Hampton
- Manufacturing, East Hampton
- Manufacturing & Industrial Consultants, East Hampton
- Martial Arts & Self Defense Schools, East Hampton
- Masonry Contractors, East Hampton - Stone Mason, Brick Mason - Install & Repair
- Material Handling & Heavy Machinery & Equipment, East Hampton
- Medical Supplies & Equipment, East Hampton
- Membership Sports & Recreation Clubs, East Hampton
- Mental Health Specialists, East Hampton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, East Hampton - Iron Works
- Methodist Church, East Hampton
- Mexican Restaurants, East Hampton
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- Mini & Self Storage, East Hampton
- Mirrors, East Hampton - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, East Hampton
- Miscellaneous Business Services, East Hampton
- Miscellaneous Government, East Hampton
- Miscellaneous Professional, East Hampton
- Motor Vehicle, East Hampton
- Motor Vehicle Rental & Leasing, East Hampton
- Motorcycle & Motor Scooters Dealers, Repair & Service, East Hampton
- Motorcycle Parts, Accessories & Dealers, East Hampton
- Motorcycle Repair & Service, East Hampton
- Moving Truck Rental , East Hampton
- Music, East Hampton
- Music Publishers & Distribution, East Hampton
- Musical Instruments & Equipment Stores, East Hampton
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