- Machinery And Equipment Manufacturers, Mattapan
- Machinery, Supplies & Equipment - Business Production Related, Mattapan
- Machinery, Supplies & Equipment - Business Supplies Related, Mattapan
- Major Appliances, Mattapan - Household & Kitchen
- Management Consultants & Services, Mattapan
- Manicurists & Pedicurists, Mattapan
- Manufacturing, Mattapan
- Manufacturing Products, Mattapan
- Martial Arts & Self Defense Schools, Mattapan
- Meat Market, Wholesale & Products, Mattapan
- Medical & Dental Management, Mattapan
- Medical Groups & Clinics, Mattapan - Medical & Health Centers
- Miscellaneous Household Item Repair, Mattapan
- Miscellaneous Photographers, Mattapan
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- Miscellaneous Professional, Mattapan
- Mission Churches, Mattapan
- Money Transfer Service, Mattapan
- Mortgage Bankers & Correspondents, Mattapan
- Motion Picture & Television Production Services, Mattapan
- Motor Vehicle, Mattapan
- Motor Vehicle Rental & Leasing, Mattapan
- Moving Truck Rental , Mattapan
- Muffler Shop & Exhaust Systems, Mattapan
- Multimedia Publishers, Mattapan - Multimedia Services & Systems
- Music, Mattapan
- Music Publishers & Distribution, Mattapan
- Musical Recording Services, Mattapan
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