- Machine Shop & Tool Repair Service, Amherst
- Machinery, Supplies & Equipment - Business Production Related, Amherst
- Machinery, Supplies & Equipment - Business Supplies Related, Amherst
- Machinery, Supplies & Equipment - Construction & Contractor Related, Amherst
- Mailbox Rental Services, Amherst
- Mailing, Delivery & Courier Service, Amherst
- Major Appliances, Amherst - Household & Kitchen
- Mammography Clinics, Amherst - Breast Cancer Screening
- Managed Care Plans, Amherst
- Management Consultants & Services, Amherst
- Manicurists & Pedicurists, Amherst
- Manufacturing, Amherst
- Manufacturing Products, Amherst
- Marriage & Family Counselors, Amherst
- Martial Arts & Self Defense Schools, Amherst
- Massage Therapists & Professional, Amherst
- Massage Therapy, Amherst
- Medical & Dental Management, Amherst
- Medical Management & Business Administration Service, Amherst
- Membership Organizations, Amherst
- Mental Health Specialists, Amherst - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Amherst
- Mexican Restaurants, Amherst
- Middle Eastern Restaurants, Amherst
- Mini & Self Storage, Amherst
- Miscellaneous Business Services, Amherst
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- Miscellaneous Government, Amherst
- Miscellaneous Manufacturing, Amherst
- Miscellaneous Personal Services, Amherst
- Miscellaneous Professional, Amherst
- Monuments, Tombstones, Markers & Memorials, Amherst
- Mortgage Bankers & Correspondents, Amherst
- Mosques, Amherst
- Motion Picture Pre & Post Production Services, Amherst
- Motor Vehicle, Amherst
- Motor Vehicle Rental & Leasing, Amherst
- Movie Theaters, Amherst
- Moving & Storage Supplies & Equipment, Amherst
- Moving Companies, Amherst
- Moving Truck Rental , Amherst
- Muffler Shop & Exhaust Systems, Amherst
- Mulch, Peat & Moss Products, Amherst
- Multimedia Publishers, Amherst - Multimedia Services & Systems
- Museums, Amherst
- Music, Amherst
- Music Lessons, Amherst
- Music Lessons - Instrumental, Amherst
- Musical Instrument Manufacturers, Amherst
- Musical Instruments & Equipment Stores, Amherst
- Musical Instruments - Violins, Amherst
- Musical Instruments Repair, Sales & Service, Amherst
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