- Machine Shop & Tool Repair Service, Niagara
- Machinery And Equipment Manufacturers, Niagara
- Machinery, Supplies & Equipment - Business Production Related, Niagara
- Machinery, Supplies & Equipment - Business Supplies Related, Niagara
- Machinery, Supplies & Equipment - Construction & Contractor Related, Niagara
- Mailing, Delivery & Courier Service, Niagara
- Manufacturing, Niagara
- Masonry Materials & Supplies, Niagara
- Meat Market, Wholesale & Products, Niagara
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- Medical Groups & Clinics, Niagara - Medical & Health Centers
- Methodist Church, Niagara
- Miscellaneous Government, Niagara
- Miscellaneous Photographers, Niagara
- Motor Vehicle, Niagara
- Motor Vehicle Rental & Leasing, Niagara
- Motorcycle Parts, Accessories & Dealers, Niagara
- Moving Truck Rental , Niagara
- Mulch, Peat & Moss Products, Niagara
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