- Machine Shop & Tool Repair Service, Mattawan
- Machinery, Supplies & Equipment - Business Production Related, Mattawan
- Machinery, Supplies & Equipment - Business Supplies Related, Mattawan
- Machinery, Supplies & Equipment - Construction & Contractor Related, Mattawan
- Manicurists & Pedicurists, Mattawan
- Manufactured & Mobile Home Movers & Transporting, Mattawan
- Manufacturing, Mattawan
- Manufacturing Products, Mattawan
- Marine Contractors & Designers, Mattawan
- Masonry Contractors, Mattawan - Stone Mason, Brick Mason - Install & Repair
- Medical Research, Mattawan
- Medical Research & Development, Mattawan - Medical Information & Research
- Membership Sports & Recreation Clubs, Mattawan
- Metal Tablets, Mattawan
- Mexican Restaurants, Mattawan
- Miscellaneous Government, Mattawan
- Miscellaneous Industry, Mattawan
- Miscellaneous Manufacturing, Mattawan
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- Miscellaneous Personal Services, Mattawan
- Miscellaneous Professional, Mattawan
- Mobile Automobile Services, Mattawan
- Mobile Home Contractors, Mattawan
- Mobile Home Improvements & Repairs, Mattawan
- Mobile Home Parks & Communities , Mattawan
- Modular & Mobile Homes For Sale, Mattawan - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Mattawan
- Mortgage Bankers & Correspondents, Mattawan
- Motor Sports, Mattawan
- Motor Vehicle, Mattawan
- Motor Vehicle Rental & Leasing, Mattawan
- Motorcycle & ATV Repair & Service, Mattawan
- Motorcycle & Motor Scooters Dealers, Repair & Service, Mattawan
- Motorcycle Repair & Service, Mattawan
- Moving Truck Rental , Mattawan
- Museums, Mattawan
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