- Machine Shop, Waterloo
- Machine Shop & Tool Repair Service, Waterloo
- Management Consultants & Services, Waterloo
- Manufacturing, Waterloo
- Masonry Materials & Supplies, Waterloo
- Methodist Church, Waterloo
- Microfilm & Imaging Service, Equipment & Supplies , Waterloo
- Miscellaneous Business Services, Waterloo
- Miscellaneous Government, Waterloo
- Mobile Automobile Services, Waterloo
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