- Machine Tools , Rumford
- Machinery And Equipment Manufacturers, Rumford
- Machinery Custom Design Manufacturers, Rumford
- Machinery, Supplies & Equipment - Business Production Related, Rumford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Rumford
- Magazine & Newspaper Stands, Rumford - Dealers & Distributors
- Management Consultants & Services, Rumford
- Manicurists & Pedicurists, Rumford
- Manufacturing, Rumford
- Marriage & Family Counselors, Rumford
- Medical Supplies & Equipment, Rumford
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- Mental Health Specialists, Rumford - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Rumford
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Rumford
- Miscellaneous Government, Rumford
- Miscellaneous Personal Services, Rumford
- Miscellaneous Professional, Rumford
- Motor Vehicle, Rumford
- Motor Vehicle Rental & Leasing, Rumford
- Moving Truck Rental , Rumford
- Museums, Rumford
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