- Machinery, Supplies & Equipment - Business Supplies Related, Republic
- Machinery, Supplies & Equipment - Construction & Contractor Related, Republic
- Manufacturing, Republic
- Massage Therapists & Professional, Republic
- Massage Therapy, Republic
- Mental Health Clinics, Republic - Treatment Centers
- Mental Health Specialists, Republic - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Republic - Iron Works
- Mini & Self Storage, Republic
- Mining, Republic
- Mining Contractors, Republic - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Republic - Mining Companies
- Miscellaneous Business Product Repair, Republic
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- Miscellaneous Government, Republic
- Monuments, Tombstones, Markers & Memorials, Republic
- Mortgage Bankers & Correspondents, Republic
- Mortgage Companies, Republic
- Mortgage Contracts & Services, Republic
- Motor Vehicle, Republic
- Motor Vehicle Rental & Leasing, Republic
- Moving Truck Rental , Republic
- Museums, Republic
- Music, Republic
- Musical Instrument Rental, Republic - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Republic
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