- Machine Tools , Johnsburg
- Machinery, Supplies & Equipment - Business Production Related, Johnsburg
- Management Consultants & Services, Johnsburg
- Manicurists & Pedicurists, Johnsburg
- Manufacturing, Johnsburg
- Manufacturing Services, Johnsburg
- Marinas & Marina Services, Johnsburg
- Masonry Contractors, Johnsburg - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Johnsburg
- Mini & Self Storage, Johnsburg
- Miscellaneous Household Item Repair, Johnsburg
- Miscellaneous Government, Johnsburg
- Miscellaneous Manufacturing, Johnsburg
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- Miscellaneous Personal Services, Johnsburg
- Moldings Materials, Johnsburg
- Mortgage Bankers & Correspondents, Johnsburg
- Motor Vehicle, Johnsburg
- Motor Vehicle Rental & Leasing, Johnsburg
- Moving Supplies & Equipment Rental, Johnsburg
- Moving Truck Rental , Johnsburg
- Music, Johnsburg
- Music Lessons, Johnsburg
- Music Lessons - Instrumental, Johnsburg
- Musical Instrument Rental, Johnsburg - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Johnsburg
- Musical Instruments Repair, Sales & Service, Johnsburg
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