- Mailing, Delivery & Courier Service, Jefferson Valley
- Management Consultants & Services, Jefferson Valley
- Manicurists & Pedicurists, Jefferson Valley
- Manufacturing, Jefferson Valley
- Marriage & Family Counselors, Jefferson Valley
- Material Handling & Heavy Machinery & Equipment, Jefferson Valley
- Medical Supplies & Equipment, Jefferson Valley
- Men's & Boys Clothing & Accessories Stores, Jefferson Valley
- Men's Clothing Stores, Jefferson Valley - Clothes & Accessories
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- Mens & Boys Hats, Gloves & Neckwear, Jefferson Valley
- Mental Health Specialists, Jefferson Valley - Psychologist, Psychiatrist, Psychotherapist, etc
- Miscellaneous Personal Services, Jefferson Valley
- Miscellaneous Professional, Jefferson Valley
- Mortgage Bankers & Correspondents, Jefferson Valley
- Motor Vehicle, Jefferson Valley
- Motor Vehicle Rental & Leasing, Jefferson Valley
- Moving Truck Rental , Jefferson Valley
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