- Machine Shop & Tool Repair Service, Waukon
- Machinery And Equipment Manufacturers, Waukon
- Machinery, Supplies & Equipment - Business Production Related, Waukon
- Machinery, Supplies & Equipment - Business Supplies Related, Waukon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Waukon
- Mail Delivery Service, Waukon
- Major Appliances, Waukon - Household & Kitchen
- Manufacturing, Waukon
- Masonry Contractors, Waukon - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Waukon
- Meat Market, Wholesale & Products, Waukon
- Membership Sports & Recreation Clubs, Waukon
- Men's Clothing Stores, Waukon - Clothes & Accessories
- Mental & Developmental Information & Referral Services, Waukon
- Mental Retardation & Developmentally Disabled Services, Waukon
- Merchandise Sales Events, Waukon
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- Metal Repair Service & Blacksmith, Waukon - Iron Works
- Methodist Church, Waukon
- Miscellaneous Government, Waukon
- Miscellaneous Industry, Waukon
- Miscellaneous Personal Services, Waukon
- Miscellaneous Photographers, Waukon
- Miscellaneous Professional, Waukon
- Monuments, Tombstones, Markers & Memorials, Waukon
- Motor Vehicle, Waukon
- Motor Vehicle Rental & Leasing, Waukon
- Motorcycle & Motor Scooters Dealers, Repair & Service, Waukon
- Motorcycle Parts, Accessories & Dealers, Waukon
- Motorcycle Repair & Service, Waukon
- Movie Theaters, Waukon
- Moving Truck Rental , Waukon
- Muffler Shop & Exhaust Systems, Waukon
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