- Machinery, Supplies & Equipment - Business Supplies Related, New Haven
- Major Appliances, New Haven - Household & Kitchen
- Management Consultants & Services, New Haven
- Manufacturing, New Haven
- Manufacturing Products, New Haven
- Meat Market, Wholesale & Products, New Haven
- Membership Sports & Recreation Clubs, New Haven
- Metal Repair Service & Blacksmith, New Haven - Iron Works
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- Mining, New Haven
- Miscellaneous Professional, New Haven
- Monuments, Tombstones, Markers & Memorials, New Haven
- Motor Vehicle, New Haven
- Motor Vehicle Rental & Leasing, New Haven
- Motorcycle Parts, Accessories & Dealers, New Haven
- Moving Truck Rental , New Haven
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