- Machinery, Supplies & Equipment - Business Production Related, Harwinton
- Machinery, Supplies & Equipment - Business Supplies Related, Harwinton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Harwinton
- Management Consultants & Services, Harwinton
- Manufacturing, Harwinton
- Marriage & Family Counselors, Harwinton
- Masonry Materials & Supplies, Harwinton
- Massage Therapists & Professional, Harwinton
- Massage Therapy, Harwinton
- Mechanical Contractors, Harwinton - Install, Service & Repair
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- Mental Health Specialists, Harwinton - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Harwinton
- Miscellaneous Agriculture, Harwinton
- Monuments, Tombstones, Markers & Memorials, Harwinton
- Mortgage Bankers & Correspondents, Harwinton
- Motor Vehicle, Harwinton
- Motor Vehicle Rental & Leasing, Harwinton
- Moving Supplies & Equipment Rental, Harwinton
- Moving Truck Rental , Harwinton
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