- Machine Shop & Tool Repair Service, Plainville
- Machinery Rebuilt & Used, Plainville
- Machinery, Supplies & Equipment - Business Production Related, Plainville
- Machinery, Supplies & Equipment - Business Supplies Related, Plainville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Plainville
- Mailing, Delivery & Courier Service, Plainville
- Management Consultants & Services, Plainville
- Manicurists & Pedicurists, Plainville
- Manufacturers Agents & Representatives, Plainville
- Manufacturers Representative, Plainville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Plainville
- Martial Arts & Self Defense Schools, Plainville
- Masonry Materials & Supplies, Plainville
- Massage Therapists & Professional, Plainville
- Massage Therapy, Plainville
- Medical Supplies & Equipment, Plainville
- Membership Sports & Recreation Clubs, Plainville
- Mental Health Specialists, Plainville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Plainville
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- Metal Repair Service & Blacksmith, Plainville - Iron Works
- Methodist Church, Plainville
- Mexican Restaurants, Plainville
- Microwave Ovens, Plainville
- Mini & Self Storage, Plainville
- Mining, Plainville
- Miscellaneous Government, Plainville
- Miscellaneous Industry, Plainville
- Miscellaneous Manufacturing, Plainville
- Miscellaneous Professional, Plainville
- Mobile Home Parks & Communities , Plainville
- Modular & Mobile Homes For Sale, Plainville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Plainville
- Motor Vehicle, Plainville
- Motor Vehicle Rental & Leasing, Plainville
- Moving & Storage Consultants, Plainville
- Moving Truck Rental , Plainville
- Muffler Shop & Exhaust Systems, Plainville
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