- Machine Shop & Tool Repair Service, Dubois
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dubois
- Major Appliances, Dubois - Household & Kitchen
- Management Consultants & Services, Dubois
- Manufacturing, Dubois
- Marble, Dubois
- Masonry Materials & Supplies, Dubois
- Massage Therapists & Professional, Dubois
- Massage Therapy, Dubois
- Metal Repair Service & Blacksmith, Dubois - Iron Works
- Miscellaneous Household Item Repair, Dubois
- Miscellaneous Government, Dubois
- Miscellaneous Personal Services, Dubois
- Miscellaneous Professional, Dubois
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- Mission Churches, Dubois
- Mortgage Bankers & Correspondents, Dubois
- Mortgage Contracts & Services, Dubois
- Mortgages & Loans, Dubois
- Motor Vehicle, Dubois
- Motor Vehicle Rental & Leasing, Dubois
- Motorcycle & ATV Repair & Service, Dubois
- Motorcycle & Motor Scooters Dealers, Repair & Service, Dubois
- Motorcycle Parts, Accessories & Dealers, Dubois
- Motorcycle Repair & Service, Dubois
- Moving Truck Rental , Dubois
- Museums, Dubois
- Music, Dubois
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