- Machine Shop & Tool Repair Service, Rumford
- Machinery, Supplies & Equipment - Business Production Related, Rumford
- Machinery, Supplies & Equipment - Business Supplies Related, Rumford
- Major Appliances, Rumford - Household & Kitchen
- Management Consultants & Services, Rumford
- Manicurists & Pedicurists, Rumford
- Manufacturing, Rumford
- Manufacturing Products, Rumford
- Marketing Consultants Professional Practices, Rumford
- Marketing Schools, Rumford
- Martial Arts & Self Defense Schools, Rumford
- Material Handling & Heavy Machinery & Equipment, Rumford
- Mechanical Contractors, Rumford - Install, Service & Repair
- Medical & Health Service Organizations, Rumford
- Medical Billing Services, Rumford
- Medical Supplies & Equipment, Rumford
- Mental Health Specialists, Rumford - Psychologist, Psychiatrist, Psychotherapist, etc
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- Metal Boxes, Rumford
- Metal Coating & Allied Services, Rumford
- Metal Pigment & Paint Products, Rumford
- Metal Plating & Polishing, Rumford
- Mexican Restaurants, Rumford
- Mini & Self Storage, Rumford
- Miscellaneous Industry, Rumford
- Miscellaneous Professional, Rumford
- Mobile Home Parks & Communities , Rumford
- Monuments, Tombstones, Markers & Memorials, Rumford
- Mortgage Bankers & Correspondents, Rumford
- Motion Picture Pre & Post Production Services, Rumford
- Motor Vehicle, Rumford
- Motor Vehicle Rental & Leasing, Rumford
- Movie Theaters, Rumford
- Moving Truck Rental , Rumford
- Muffler Shop & Exhaust Systems, Rumford
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