- Machinery, Supplies & Equipment - Business Supplies Related, Montauk
- Machinery, Supplies & Equipment - Construction & Contractor Related, Montauk
- Maintenance, Cleaning & Sanitation, Montauk
- Management Consultants & Services, Montauk
- Manufacturing, Montauk
- Marinas & Marina Services, Montauk
- Marine Electronic Equipment, Montauk
- Marine Supplies & Equipment, Montauk - Boat Supplies
- Masonry Contractors, Montauk - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Montauk
- Massage Therapists & Professional, Montauk
- Massage Therapy, Montauk
- Meat Market, Wholesale & Products, Montauk
- Medical Supplies & Equipment, Montauk
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- Mental Health Specialists, Montauk - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Montauk
- Mildew Removal & Control, Montauk - Mold Removal
- Mini Golf Courses, Montauk
- Miscellaneous Government, Montauk
- Miscellaneous Personal Services, Montauk
- Miscellaneous Professional, Montauk
- Mobile Home Parks & Communities , Montauk
- Motor Vehicle, Montauk
- Motor Vehicle Rental & Leasing, Montauk
- Movie Theaters, Montauk
- Moving Truck Rental , Montauk
- Museums, Montauk
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