- Machinery, Supplies & Equipment - Business Production Related, West Boylston
- Machinery, Supplies & Equipment - Business Supplies Related, West Boylston
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Boylston
- Magicians & Hypnotist Entertainers, West Boylston
- Malls & Shopping Centers, West Boylston
- Management Consultants & Services, West Boylston
- Manicurists & Pedicurists, West Boylston
- Manufacturers Agents & Representatives, West Boylston
- Manufacturers Representative, West Boylston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, West Boylston
- Manufacturing Products, West Boylston
- Marriage & Family Counselors, West Boylston
- Martial Arts & Self Defense Schools, West Boylston
- Mary Kay Cosmetics, West Boylston
- Masonry Contractors, West Boylston - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, West Boylston
- Massage Therapists & Professional, West Boylston
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- Massage Therapy, West Boylston
- Meat Smoking & Curing Services, West Boylston
- Medical & Health Service Organizations, West Boylston
- Medical Billing Services, West Boylston
- Mental Health Specialists, West Boylston - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, West Boylston - Iron Works
- Methodist Church, West Boylston
- Miscellaneous Government, West Boylston
- Miscellaneous Manufacturing, West Boylston
- Miscellaneous Professional, West Boylston
- Mortgage Bankers & Correspondents, West Boylston
- Mortgages & Loans, West Boylston
- Motion Picture & Television Production Services, West Boylston
- Motion Picture Dists & Producers, West Boylston
- Motor Vehicle, West Boylston
- Movie Theaters, West Boylston
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