- Machine Shop, Southbridge
- Machine Shop & Tool Repair Service, Southbridge
- Machinery, Supplies & Equipment - Business Supplies Related, Southbridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Southbridge
- Mailing, Delivery & Courier Service, Southbridge
- Management Consultants & Services, Southbridge
- Manicurists & Pedicurists, Southbridge
- Manufacturing, Southbridge
- Manufacturing Products, Southbridge
- Marinas & Aquariums, Southbridge
- Marriage & Family Counselors, Southbridge
- Masonry Contractors, Southbridge - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Southbridge
- Massage Therapy, Southbridge
- Medical & Health Service Organizations, Southbridge
- Medical Equipment Manufacturers, Southbridge
- Medical Records Service , Southbridge
- Medical Supplies & Equipment, Southbridge
- Mental Health Specialists, Southbridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Heat Treating, Southbridge
- Metal Repair Service & Blacksmith, Southbridge - Iron Works
- Methodist Church, Southbridge
|
- Mining, Southbridge
- Mirrors, Southbridge - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, Southbridge
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Southbridge
- Miscellaneous Government, Southbridge
- Miscellaneous Industry, Southbridge
- Miscellaneous Manufacturing, Southbridge
- Miscellaneous Photographers, Southbridge
- Miscellaneous Professional, Southbridge
- Monuments, Tombstones, Markers & Memorials, Southbridge
- Mortgage Bankers & Correspondents, Southbridge
- Motor Vehicle, Southbridge
- Motor Vehicle Rental & Leasing, Southbridge
- Moving Companies, Southbridge
- Moving Truck Rental , Southbridge
- Muffler Shop & Exhaust Systems, Southbridge
- Music, Southbridge
- Music Lessons, Southbridge
- Music Lessons - Instrumental, Southbridge
- Musical Instrument Manufacturers, Southbridge
- Musical Instruments Supplies & Accessories Manufacturers, Southbridge
|