- Machine Shop & Tool Repair Service, Plantsville
- Machinery, Supplies & Equipment - Business Production Related, Plantsville
- Machinery, Supplies & Equipment - Business Supplies Related, Plantsville
- Management Consultants & Services, Plantsville
- Manicurists & Pedicurists, Plantsville
- Manufacturing, Plantsville
- Manufacturing Products, Plantsville
- Marriage & Family Counselors, Plantsville
- Martial Arts & Self Defense Schools, Plantsville
- Masonry Contractors, Plantsville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Plantsville
- Massage Therapists & Professional, Plantsville
- Massage Therapy, Plantsville
- Mechanical Contractors, Plantsville - Install, Service & Repair
- Medical Supplies & Equipment, Plantsville
- Membership Sports & Recreation Clubs, Plantsville
- Mental Health Specialists, Plantsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Plantsville
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- Metal Coating & Allied Services, Plantsville
- Metal Products, Plantsville
- Mexican Restaurants, Plantsville
- Mini & Self Storage, Plantsville
- Miscellaneous Household Item Repair, Plantsville
- Miscellaneous Industry, Plantsville
- Miscellaneous Manufacturing, Plantsville
- Miscellaneous Personal Services, Plantsville
- Miscellaneous Professional, Plantsville
- Mortgage Bankers & Correspondents, Plantsville
- Mortgages & Loans, Plantsville
- Motor Vehicle, Plantsville
- Muffler Shop & Exhaust Systems, Plantsville
- Music, Plantsville
- Music Lessons, Plantsville
- Music Lessons - Instrumental, Plantsville
- Musical Instrument Rental, Plantsville - Band & Orchestra Instruments
- Musical Instruments Repair, Sales & Service, Plantsville
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