- Machine Shop, Warren
- Machine Shop & Tool Repair Service, Warren
- Machinery, Supplies & Equipment - Business Supplies Related, Warren
- Machinery, Supplies & Equipment - Construction & Contractor Related, Warren
- Manicurists & Pedicurists, Warren
- Manufacturing, Warren
- Marriage & Family Counselors, Warren
- Masonry Materials & Supplies, Warren
- Medical & Health Service Organizations, Warren
- Medical Supplies & Equipment, Warren
- Mental Health Clinics, Warren - Treatment Centers
- Mental Health Specialists, Warren - Psychologist, Psychiatrist, Psychotherapist, etc
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- Merchandise Sales Events, Warren
- Metal Buildings, Warren - Kits, Homes, Steel Buildings, etc
- Methodist Church, Warren
- Mexican Restaurants, Warren
- Ministries Church, Warren
- Miscellaneous Government, Warren
- Miscellaneous Professional, Warren
- Monuments, Tombstones, Markers & Memorials, Warren
- Motor Vehicle, Warren
- Motor Vehicle Rental & Leasing, Warren
- Moving Truck Rental , Warren
- Museums, Warren
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