- Machinery, Supplies & Equipment - Business Supplies Related, Whitinsville
- Mail Delivery Service, Whitinsville
- Mailing, Delivery & Courier Service, Whitinsville
- Malls & Shopping Centers, Whitinsville
- Management Consultants & Services, Whitinsville
- Manicurists & Pedicurists, Whitinsville
- Manufacturers Agents & Representatives, Whitinsville
- Manufacturers Representative, Whitinsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Whitinsville
- Medical Groups & Clinics, Whitinsville - Medical & Health Centers
- Membership Sports & Recreation Clubs, Whitinsville
- Methodist Church, Whitinsville
- Miscellaneous Manufacturing, Whitinsville
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- Miscellaneous Personal Services, Whitinsville
- Miscellaneous Photographers, Whitinsville
- Miscellaneous Professional, Whitinsville
- Monuments, Tombstones, Markers & Memorials, Whitinsville
- Mortgage Bankers & Correspondents, Whitinsville
- Motor Vehicle, Whitinsville
- Motor Vehicle Rental & Leasing, Whitinsville
- Moving Truck Rental , Whitinsville
- Music, Whitinsville
- Music Lessons, Whitinsville
- Music Lessons - Instrumental, Whitinsville
- Musical Instruments & Equipment Stores, Whitinsville
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