- Machine Shop, Monticello
- Machinery, Supplies & Equipment - Construction & Contractor Related, Monticello
- Management Consultants & Services, Monticello
- Manicurists & Pedicurists, Monticello
- Manufacturing, Monticello
- Masonry Materials & Supplies, Monticello
- Medical & Health Service Organizations, Monticello
- Mental Health Clinics, Monticello - Treatment Centers
- Mental Health Specialists, Monticello - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Monticello
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- Miscellaneous Business Services, Monticello
- Miscellaneous Government, Monticello
- Miscellaneous Professional, Monticello
- Mission Churches, Monticello
- Mortgage Bankers & Correspondents, Monticello
- Motor Vehicle, Monticello
- Motor Vehicle Rental & Leasing, Monticello
- Moving Supplies & Equipment Rental, Monticello
- Moving Truck Rental , Monticello
- Museums, Monticello
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