- Machine Shop & Tool Repair Service, Jaffrey
- Machinery, Supplies & Equipment - Business Production Related, Jaffrey
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jaffrey
- Mailing, Delivery & Courier Service, Jaffrey
- Major Appliances, Jaffrey - Household & Kitchen
- Management Consultants & Services, Jaffrey
- Manicurists & Pedicurists, Jaffrey
- Manufacturers Agents & Representatives, Jaffrey
- Manufacturers Representative, Jaffrey - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Jaffrey
- Manufacturing Products, Jaffrey
- Marriage & Family Counselors, Jaffrey
- Martial Arts & Self Defense Schools, Jaffrey
- Masonry Contractors, Jaffrey - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Jaffrey
- Medical Groups & Clinics, Jaffrey - Medical & Health Centers
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- Medical Supplies & Equipment, Jaffrey
- Mental Health Specialists, Jaffrey - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Jaffrey
- Mini & Self Storage, Jaffrey
- Miscellaneous Agriculture, Jaffrey
- Miscellaneous Business Services, Jaffrey
- Miscellaneous Government, Jaffrey
- Miscellaneous Manufacturing, Jaffrey
- Miscellaneous Professional, Jaffrey
- Mobile Home Parks & Communities , Jaffrey
- Motor Vehicle, Jaffrey
- Motor Vehicle Rental & Leasing, Jaffrey
- Mountain & Rock Climbing Equipment, Jaffrey
- Moving Truck Rental , Jaffrey
- Music, Jaffrey
- Musical Instruments & Equipment Stores, Jaffrey
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