- Machine Shop & Tool Repair Service, Platteville
- Machinery, Supplies & Equipment - Business Production Related, Platteville
- Machinery, Supplies & Equipment - Business Supplies Related, Platteville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Platteville
- Maintenance, Cleaning & Sanitation, Platteville
- Major Appliances, Platteville - Household & Kitchen
- Management Consultants & Services, Platteville
- Manicurists & Pedicurists, Platteville
- Manufacturers Agents & Representatives, Platteville
- Manufacturers Representative, Platteville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Platteville
- Marketing Schools, Platteville
- Marriage & Family Counselors, Platteville
- Masonry Contractors, Platteville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Platteville
- Massage Therapists & Professional, Platteville
- Massage Therapy, Platteville
- Material Handling Equipment, Platteville - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Diagnostic Clinics, Platteville - Clinical Labs & Centers
- Medical Groups & Clinics, Platteville - Medical & Health Centers
- Medical Supplies & Equipment, Platteville
- Membership Sports & Recreation Clubs, Platteville
- Mental Health Specialists, Platteville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Platteville
- Metal Repair Service & Blacksmith, Platteville - Iron Works
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- Methodist Church, Platteville
- Mexican Food & Goods Products, Platteville
- Mexican Restaurants, Platteville
- Mini & Self Storage, Platteville
- Mining, Platteville
- Miscellaneous Government, Platteville
- Miscellaneous Industry, Platteville
- Miscellaneous Manufacturing, Platteville
- Miscellaneous Personal Services, Platteville
- Miscellaneous Photographers, Platteville
- Miscellaneous Professional, Platteville
- Mobile Home Parks & Communities , Platteville
- Mortgage Bankers & Correspondents, Platteville
- Mortgage Contracts & Services, Platteville
- Motor Vehicle, Platteville
- Motor Vehicle Rental & Leasing, Platteville
- Movie Theaters, Platteville
- Moving Supplies & Equipment Rental, Platteville
- Moving Truck Rental , Platteville
- Muffler Shop & Exhaust Systems, Platteville
- Music, Platteville
- Musical Instruments & Equipment Stores, Platteville
- Musical Instruments - Guitars, Platteville
- Musical Instruments Repair, Sales & Service, Platteville
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