- Machine Shop & Tool Repair Service, South Milwaukee
- Machine Shop Rotary Surface Grinding, South Milwaukee - Tool Grinding & Sharpening
- Machinery, Supplies & Equipment - Business Production Related, South Milwaukee
- Machinery, Supplies & Equipment - Construction & Contractor Related, South Milwaukee
- Maintenance, Cleaning & Sanitation, South Milwaukee
- Major Appliances, South Milwaukee - Household & Kitchen
- Management Consultants & Services, South Milwaukee
- Manicurists & Pedicurists, South Milwaukee
- Manufacturing, South Milwaukee
- Manufacturing Products, South Milwaukee
- Marriage & Family Counselors, South Milwaukee
- Medical Supplies & Equipment, South Milwaukee
- Membership Sports & Recreation Clubs, South Milwaukee
- Metal Repair Service & Blacksmith, South Milwaukee - Iron Works
- Metal Stampings Manufacturers, South Milwaukee
- Methodist Church, South Milwaukee
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- Mexican Restaurants, South Milwaukee
- Mildew Removal & Control, South Milwaukee - Mold Removal
- Mining, South Milwaukee
- Mining Contractors, South Milwaukee - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, South Milwaukee - Mining Companies
- Miscellaneous Government, South Milwaukee
- Miscellaneous Industry, South Milwaukee
- Miscellaneous Metal Work Manufacturers, South Milwaukee
- Miscellaneous Professional, South Milwaukee
- Mortgage Bankers & Correspondents, South Milwaukee
- Motor Vehicle, South Milwaukee
- Motor Vehicle Rental & Leasing, South Milwaukee
- Moving Supplies & Equipment Rental, South Milwaukee
- Moving Truck Rental , South Milwaukee
- Music, South Milwaukee
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