- Machine Shop, Plainville
- Machine Shop & Tool Repair Service, Plainville
- Machine Tools Manufacturers Metal Cutting Types, Plainville
- Machinery And Equipment Manufacturers, Plainville
- Machinery Custom Design Manufacturers, Plainville
- Machinery Repair & Rebuild, 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
- Maintenance, Cleaning & Sanitation, Plainville
- Major Appliances, Plainville - Household & Kitchen
- Management Consultants & Services, Plainville
- Manicurists & Pedicurists, Plainville
- Manufacturing, Plainville
- Manufacturing Products, Plainville
- Marble, Plainville
- Marble Contractors, Plainville - Installation, Cleaning & Removal Services
- Marine Contractors & Designers, Plainville
- Marriage & Family Counselors, Plainville
- Masonry Contractors, Plainville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Plainville
- Massage Therapy, Plainville
- Mastectomy Apparel, Forms, Prostheses & Supplies, Plainville
- Material Handling & Heavy Machinery & Equipment, Plainville
- Mechanical Contractors, Plainville - Install, Service & Repair
- Mechanical Engineer, Plainville - Mechanical Engineering Service
- Medical Diagnostic Clinics, Plainville - Clinical Labs & Centers
- Medical Supplies & Equipment, Plainville
- Membership Sports & Recreation Clubs, Plainville
- Men's Clothing Stores, Plainville - Clothes & Accessories
- Mental Health Clinics, Plainville - Treatment Centers
- Metal Coating & Allied Services, Plainville
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- Metal Finishers, Plainville
- Metal Plating & Polishing, Plainville
- Metal Repair Service & Blacksmith, Plainville - Iron Works
- Metal Stampings Manufacturers, Plainville
- Metal Working Machinery, Plainville
- Mexican Restaurants, Plainville
- Mildew Removal & Control, Plainville - Mold Removal
- Military Supplies, Plainville
- Mini & Self Storage, Plainville
- Miscellaneous Business Product Repair, Plainville
- Miscellaneous Industry, Plainville
- Miscellaneous Metal Work Manufacturers, Plainville
- Miscellaneous Personal Services, Plainville
- Miscellaneous Photographers, Plainville
- Miscellaneous Professional, Plainville
- Modular & Mobile Homes For Sale, Plainville - Manufactured Homes Sale & Service
- Money Transfer Service, Plainville
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Plainville
- Mortgage Bankers & Correspondents, Plainville
- Motor Vehicle, Plainville
- Motor Vehicle Rental & Leasing, Plainville
- Motorcycle Parts, Accessories & Dealers, Plainville
- Movie Theaters, Plainville
- Moving Companies, Plainville
- Moving Supplies & Equipment Rental, Plainville
- Moving Truck Rental , Plainville
- Museums, Plainville
- Music, Plainville
- Music Lessons, Plainville
- Music Lessons - Instrumental, Plainville
- Music Production Services, Plainville
- Musical Recording Services, Plainville
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