- Machine Shop & Tool Repair Service, Ellington
- Machinery, Supplies & Equipment - Business Supplies Related, Ellington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ellington
- Maintenance, Cleaning & Sanitation, Ellington
- Major Appliances, Ellington - Household & Kitchen
- Management Consultants & Services, Ellington
- Manicurists & Pedicurists, Ellington
- Manufacturers Agents & Representatives, Ellington
- Manufacturers Representative, Ellington - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ellington
- Marriage & Family Counselors, Ellington
- Martial Arts & Self Defense Schools, Ellington
- Medical Diagnostic Clinics, Ellington - Clinical Labs & Centers
- Mental Health Specialists, Ellington - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Ellington - Iron Works
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- Methodist Church, Ellington
- Mildew Removal & Control, Ellington - Mold Removal
- Mini & Self Storage, Ellington
- Miscellaneous Manufacturing, Ellington
- Miscellaneous Photographers, Ellington
- Miscellaneous Professional, Ellington
- Mortgage Bankers & Correspondents, Ellington
- Mosques, Ellington
- Motor Vehicle, Ellington
- Motor Vehicle Rental & Leasing, Ellington
- Motorcycle Driving School, Ellington
- Motorcycle Parts, Accessories & Dealers, Ellington
- Moving Truck Rental , Ellington
- Musical Instruments Repair, Sales & Service, Ellington
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