- Machine Shop & Tool Repair Service, Somersworth
- Machine Shop Rotary Surface Grinding, Somersworth - Tool Grinding & Sharpening
- Machinery And Equipment Manufacturers, Somersworth
- Machinery, Supplies & Equipment - Business Supplies Related, Somersworth
- Machinery, Supplies & Equipment - Construction & Contractor Related, Somersworth
- Mammography Clinics, Somersworth - Breast Cancer Screening
- Management Consultants & Services, Somersworth
- Manicurists & Pedicurists, Somersworth
- Manufacturing, Somersworth
- Manufacturing Products, Somersworth
- Marriage & Family Counselors, Somersworth
- Martial Arts & Self Defense Schools, Somersworth
- Masonry Contractors, Somersworth - Stone Mason, Brick Mason - Install & Repair
- Mats & Matting, Somersworth
- Meat Market, Wholesale & Products, Somersworth
- Mechanical Engineer, Somersworth - Mechanical Engineering Service
- Medical Supplies & Equipment, Somersworth
- Mental Health Specialists, Somersworth - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Repair Service & Blacksmith, Somersworth - Iron Works
- Metal Tanks, Somersworth
- Mini & Self Storage, Somersworth
- Miscellaneous Government, Somersworth
- Miscellaneous Manufacturing, Somersworth
- Miscellaneous Professional, Somersworth
- Mobile Home Parks & Communities , Somersworth
- Mortgage Bankers & Correspondents, Somersworth
- Motor Vehicle, Somersworth
- Motor Vehicle Rental & Leasing, Somersworth
- Motorcycle & Motor Scooters Dealers, Repair & Service, Somersworth
- Motorcycle Parts, Accessories & Dealers, Somersworth
- Motorcycle Repair & Service, Somersworth
- Moving Companies, Somersworth
- Moving Truck Rental , Somersworth
- Muffler Shop & Exhaust Systems, Somersworth
- Music, Somersworth
- Musical Recording Services, Somersworth
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