- Machine Shop & Tool Repair Service, Yaphank
- Machinery, Supplies & Equipment - Business Production Related, Yaphank
- Machinery, Supplies & Equipment - Business Supplies Related, Yaphank
- Machinery, Supplies & Equipment - Construction & Contractor Related, Yaphank
- Management Consultants & Services, Yaphank
- Manicurists & Pedicurists, Yaphank
- Manufacturers Agents & Representatives, Yaphank
- Manufacturing, Yaphank
- Manufacturing Products, Yaphank
- Masonry Materials & Supplies, Yaphank
- Meat Market, Wholesale & Products, Yaphank
- Mental Health Specialists, Yaphank - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Yaphank
- Messenger Service, Yaphank - Message Receiving & Forwarding Service
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- Metal Distributors, Yaphank
- Metal Repair Service & Blacksmith, Yaphank - Iron Works
- Metallic Fabrics, Yaphank
- Millwork Contractors, Yaphank
- Miscellaneous Agriculture, Yaphank
- Miscellaneous Government, Yaphank
- Miscellaneous Manufacturing, Yaphank
- Miscellaneous Professional, Yaphank
- Motor Vehicle, Yaphank
- Motor Vehicle Rental & Leasing, Yaphank
- Moving Companies, Yaphank
- Moving Services - Labor & Material, Yaphank
- Moving Truck Rental , Yaphank
- Mulch, Peat & Moss Products, Yaphank
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