- Machinery, Supplies & Equipment - Business Supplies Related, Newbury
- Management Consultants & Services, Newbury
- Manufacturers Agents & Representatives, Newbury
- Manufacturers Representative, Newbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Newbury
- Marinas & Marina Services, Newbury
- Marine Products And Services, Newbury
- Marine Repair & Service Stations, Newbury
- Marine Supplies & Equipment Repair, Newbury - Boat Supplies & Equipment
- Marriage & Family Counselors, Newbury
- Masonry Materials & Supplies, Newbury
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- Meat Market, Wholesale & Products, Newbury
- Mental Health Specialists, Newbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Newbury - Kits, Homes, Steel Buildings, etc
- Miscellaneous Household Item Repair, Newbury
- Miscellaneous Business Services, Newbury
- Miscellaneous Manufacturing, Newbury
- Miscellaneous Personal Services, Newbury
- Monuments, Tombstones, Markers & Memorials, Newbury
- Motor Vehicle, Newbury
- Motorcycle Parts, Accessories & Dealers, Newbury
- Museums, Newbury
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