- Machinery, Supplies & Equipment - Business Production Related, Duxbury
- Mailing List Service, Brokers & Compilers, Duxbury
- Mailing, Delivery & Courier Service, Duxbury
- Major Appliances, Duxbury - Household & Kitchen
- Management Consultants & Services, Duxbury
- Manicurists & Pedicurists, Duxbury
- Manufacturers Agents & Representatives, Duxbury
- Manufacturers Representative, Duxbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Duxbury
- Marinas & Marina Services, Duxbury
- Marine Supplies & Equipment, Duxbury - Boat Supplies
- Marketing Schools, Duxbury
- Massage Therapists & Professional, Duxbury
- Massage Therapy, Duxbury
- Medical Billing Services, Duxbury
- Medical Supplies & Equipment, Duxbury
- Membership Sports & Recreation Clubs, Duxbury
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- Mental Health Specialists, Duxbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Duxbury - Iron Works
- Metaphysical Churches, Duxbury
- Methodist Church, Duxbury
- Mining, Duxbury
- Miscellaneous Household Item Repair, Duxbury
- Miscellaneous Manufacturing, Duxbury
- Miscellaneous Personal Services, Duxbury
- Miscellaneous Photographers, Duxbury
- Miscellaneous Professional, Duxbury
- Mortgage Bankers & Correspondents, Duxbury
- Motor Vehicle, Duxbury
- Museums, Duxbury
- Music, Duxbury
- Music Lessons, Duxbury
- Music Lessons - Instrumental, Duxbury
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