- Machinery, Supplies & Equipment - Business Production Related, Plympton
- Manufacturing, Plympton
- Manufacturing Products, Plympton
- Marriage & Family Counselors, Plympton
- Martial Arts & Self Defense Schools, Plympton
- Mental & Developmental Information & Referral Services, Plympton
- Mental Health Specialists, Plympton - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Plympton
- Metal Plating & Polishing, Plympton
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- Miscellaneous Agriculture, Plympton
- Miscellaneous Business Services, Plympton
- Miscellaneous Manufacturing, Plympton
- Miscellaneous Personal Services, Plympton
- Miscellaneous Professional, Plympton
- Motor Vehicle, Plympton
- Motorcycle & Motor Scooters Dealers, Repair & Service, Plympton
- Motorcycle Repair & Service, Plympton
- Muffler Shop & Exhaust Systems, Plympton
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