- Machine Shop & Tool Repair Service, Ayer
- Machinery, Supplies & Equipment - Business Supplies Related, Ayer
- Management Consultants & Services, Ayer
- Manicurists & Pedicurists, Ayer
- Manufacturers Agents & Representatives, Ayer
- Manufacturers Representative, Ayer - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ayer
- Manufacturing Products, Ayer
- Marriage & Family Counselors, Ayer
- Masonry Contractors, Ayer - Stone Mason, Brick Mason - Install & Repair
- Massage Therapy, Ayer
- Mechanical Engineer, Ayer - Mechanical Engineering Service
- Medical Billing Services, Ayer
- Medical Identification Jewelry, Ayer
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- Medical Supplies & Equipment, Ayer
- Methodist Church, Ayer
- Millwork Contractors, Ayer
- Mirrors, Ayer - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, Ayer
- Miscellaneous Manufacturing, Ayer
- Miscellaneous Personal Services, Ayer
- Miscellaneous Professional, Ayer
- Motor Vehicle, Ayer
- Motor Vehicle Rental & Leasing, Ayer
- Motorcycle Parts, Accessories & Dealers, Ayer
- Moving Companies, Ayer
- Moving Truck Rental , Ayer
- Muffler Shop & Exhaust Systems, Ayer
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