- Machine Shop & Tool Repair Service, Welch
- Machinery, Supplies & Equipment - Business Production Related, Welch
- Management Consultants & Services, Welch
- Manufacturing, Welch
- Marriage & Family Counselors, Welch
- Medical Supplies & Equipment, Welch
- Mental Health Specialists, Welch - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Welch
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- Mining, Welch
- Mining Contractors, Welch - Mining Companies, Contractors & Brokers
- Mining Services, Welch
- Mining, Crude-Oil Production, Welch - Mining Companies
- Miscellaneous Business Services, Welch
- Miscellaneous Government, Welch
- Motor Vehicle, Welch
- Movie Theaters, Welch
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