- Machine Shop, Amesbury
- Machine Shop & Tool Repair Service, Amesbury
- Machinery And Equipment Manufacturers, Amesbury
- Machinery, Supplies & Equipment - Business Production Related, Amesbury
- Machinery, Supplies & Equipment - Business Supplies Related, Amesbury
- Machinery, Supplies & Equipment - Construction & Contractor Related, Amesbury
- Mail Delivery Service, Amesbury
- Management Consultants & Services, Amesbury
- Manicurists & Pedicurists, Amesbury
- Manufacturers Agents & Representatives, Amesbury
- Manufacturers Representative, Amesbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Amesbury
- Manufacturing Products, Amesbury
- Marble Tiles, Amesbury
- Marinas & Marina Services, Amesbury
- Market Research & Analysis , Amesbury - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Amesbury
- Martial Arts & Self Defense Schools, Amesbury
- Masonry Materials & Supplies, Amesbury
- Massage Therapists & Professional, Amesbury
- Massage Therapy, Amesbury
- Medical Supplies & Equipment, Amesbury
- Membership Sports & Recreation Clubs, Amesbury
- Mental Health Specialists, Amesbury - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Amesbury
- Metal Finishers, Amesbury
- Metal Heat Treating, Amesbury
- Metal Plating & Polishing, Amesbury
- Metal Repair Service & Blacksmith, Amesbury - Iron Works
- Methodist Church, Amesbury
- Mexican Restaurants, Amesbury
- Microwave Communications, Amesbury
- Millwork Contractors, Amesbury
- Ministries Church, Amesbury
- Miscellaneous Household Item Repair, Amesbury
- Miscellaneous Agriculture, Amesbury
- Miscellaneous Government, Amesbury
- Miscellaneous Manufacturing, Amesbury
- Miscellaneous Photographers, Amesbury
- Miscellaneous Professional, Amesbury
- Mortgage Bankers & Correspondents, Amesbury
- Motor Vehicle, Amesbury
- Movie Theaters, Amesbury
- Museums, Amesbury
- Music, Amesbury
- Musical Instruments & Equipment Stores, Amesbury
- Musical Recording Services, Amesbury
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