- Machinery, Supplies & Equipment - Business Production Related, Newton Center
- Machinery, Supplies & Equipment - Business Supplies Related, Newton Center
- Mailbox Rental Services, Newton Center
- Mailing, Delivery & Courier Service, Newton Center
- Malpractice Attorneys & Lawyers, Newton Center
- Malpractice Attorneys & Lawyers, Newton Center
- Malpractice Lawyers & Attorneys, Newton Center
- Management Consultants & Services, Newton Center
- Manicurists & Pedicurists, Newton Center
- Manufacturing, Newton Center
- Manufacturing & Industrial Consultants, Newton Center
- Manufacturing Equipment & Supplies, Newton Center
- Marriage & Family Counselors, Newton Center
- Masonry Contractors, Newton Center - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Newton Center
- Massage Therapy, Newton Center
- Massage Therapy Relaxation, Newton Center
- Mausoleums Developers, Newton Center
- Medical & Dental Management, Newton Center
- Medical Diagnostic Clinics, Newton Center - Clinical Labs & Centers
- Medical Equipment Manufacturers, Newton Center
- Medical Management & Business Administration Service, Newton Center
- Medical Research, Newton Center
- Medical Research & Development, Newton Center - Medical Information & Research
- Medical Supplies & Equipment, Newton Center
- Mediterranean Restaurants, Newton Center
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- Membership Sports & Recreation Clubs, Newton Center
- Mental Health Specialists, Newton Center - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Newton Center
- Merchandising & Pricing Equipment, Newton Center
- Mexican Restaurants, Newton Center
- Middle Eastern Restaurants, Newton Center
- Mind-Body Massage, Newton Center
- Mining, Newton Center
- Miscellaneous Business Services, Newton Center
- Miscellaneous Government, Newton Center
- Miscellaneous Personal Services, Newton Center
- Miscellaneous Professional, Newton Center
- Monuments, Tombstones, Markers & Memorials, Newton Center
- Mortgage Bankers & Correspondents, Newton Center
- Mortgage Service Bureaus, Newton Center
- Motor Vehicle, Newton Center
- Moving & Storage Supplies & Equipment, Newton Center
- Mulch, Peat & Moss Products, Newton Center
- Museums, Newton Center
- Music, Newton Center
- Music Entertainment, Newton Center
- Musical Instrument Rental, Newton Center - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Newton Center
- Musical Instruments - Violins, Newton Center
- Musical Instruments Repair, Sales & Service, Newton Center
- Musicians, Bands & Disc Jockeys, Newton Center
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