- Machinery, Supplies & Equipment - Business Production Related, Waterloo
- Machinery, Supplies & Equipment - Business Supplies Related, Waterloo
- Manufacturing, Waterloo
- Manufacturing Products, Waterloo
- Manufacturing Services, Waterloo
- Marketing, Waterloo
- Masonry Materials & Supplies, Waterloo
- Men's & Boys Clothing & Accessories Stores, Waterloo
- Mens & Boys Jeans & Western Wear Stores, Waterloo
- Metal Bending & Straightening, Waterloo
- Metal Buildings, Waterloo - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Waterloo - Iron Works
- Methodist Church, Waterloo
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- Mini & Self Storage, Waterloo
- Mining, Waterloo
- Miscellaneous Agriculture, Waterloo
- Miscellaneous Government, Waterloo
- Miscellaneous Personal Services, Waterloo
- Miscellaneous Professional, Waterloo
- Mobile Home Parks & Communities , Waterloo
- Mortgage Bankers & Correspondents, Waterloo
- Motor Vehicle, Waterloo
- Motor Vehicle Rental & Leasing, Waterloo
- Moving Supplies & Equipment Rental, Waterloo
- Moving Truck Rental , Waterloo
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