- Machine Shop & Tool Repair Service, Pittsfield
- Machinery, Supplies & Equipment - Business Supplies Related, Pittsfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Pittsfield
- Major Appliances, Pittsfield - Household & Kitchen
- Manufacturers Agents & Representatives, Pittsfield
- Manufacturers Representative, Pittsfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Pittsfield
- Marriage & Family Counselors, Pittsfield
- Masonry Materials & Supplies, Pittsfield
- Massage Therapists & Professional, Pittsfield
- Massage Therapy, Pittsfield
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- Mastectomy Apparel, Forms, Prostheses & Supplies, Pittsfield
- Medical Supplies & Equipment, Pittsfield
- Miscellaneous Manufacturing, Pittsfield
- Miscellaneous Personal Services, Pittsfield
- Monuments, Tombstones, Markers & Memorials, Pittsfield
- Motor Vehicle, Pittsfield
- Motor Vehicle Rental & Leasing, Pittsfield
- Movie Theaters, Pittsfield
- Moving Truck Rental , Pittsfield
- Museums, Pittsfield
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