- Machinery, Supplies & Equipment - Business Production Related, Monahans
- Machinery, Supplies & Equipment - Construction & Contractor Related, Monahans
- Mailing, Delivery & Courier Service, Monahans
- Manicurists & Pedicurists, Monahans
- Manufacturing, Monahans
- Masonry Materials & Supplies, Monahans
- Medical Groups & Clinics, Monahans - Medical & Health Centers
- Men's & Boys Clothing & Accessories Stores, Monahans
- Mens & Boys Jeans & Western Wear Stores, Monahans
- Mental Health Clinics, Monahans - Treatment Centers
- Mental Health Specialists, Monahans - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Monahans
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- Merle Norman Cosmetics, Monahans
- Methodist Church, Monahans
- Mexican Restaurants, Monahans
- Mining, Monahans
- Miscellaneous Business Product Repair, Monahans
- Miscellaneous Business Services, Monahans
- Miscellaneous Government, Monahans
- Modular & Mobile Homes For Sale, Monahans - Manufactured Homes Sale & Service
- Motor Vehicle, Monahans
- Motor Vehicle Rental & Leasing, Monahans
- Moving Truck Rental , Monahans
- Museums, Monahans
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