- Machine Shop & Tool Repair Service, Quanah
- Machinery, Supplies & Equipment - Construction & Contractor Related, Quanah
- Mail Delivery Service, Quanah
- Manicurists & Pedicurists, Quanah
- Marriage & Family Counselors, Quanah
- Medical Groups & Clinics, Quanah - Medical & Health Centers
- Medical Supplies & Equipment, Quanah
- Men's & Boys Clothing & Accessories Stores, Quanah
- Mens & Boys Jeans & Western Wear Stores, Quanah
- Mental Health Clinics, Quanah - Treatment Centers
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- Mental Health Specialists, Quanah - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Quanah
- Mining, Quanah
- Miscellaneous Government, Quanah
- Mortgage Bankers & Correspondents, Quanah
- Motor Vehicle, Quanah
- Motor Vehicle Rental & Leasing, Quanah
- Moving Truck Rental , Quanah
- Muffler Shop & Exhaust Systems, Quanah
- Museums, Quanah
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