- Machine Shop & Tool Repair Service, Libby
- Machinery, Supplies & Equipment - Business Supplies Related, Libby
- Machinery, Supplies & Equipment - Construction & Contractor Related, Libby
- Mail Delivery Service, Libby
- Management Consultants & Services, Libby
- Manufacturing, Libby
- Marriage & Family Counselors, Libby
- Masonry Materials & Supplies, Libby
- Mass Transit Vehicle Dealers, Libby
- Medical Groups & Clinics, Libby - Medical & Health Centers
- Medical Supplies & Equipment, Libby
- Mental Health Specialists, Libby - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Libby - Iron Works
- Methodist Church, Libby
- Mexican Restaurants, Libby
- Midwives, Libby
- Mini & Self Storage, Libby
- Miniatures Collectors, Libby
- Mining, Libby
- Mining Contractors, Libby - Mining Companies, Contractors & Brokers
- Mining Equipment & Supplies, Libby
- Mining, Crude-Oil Production, Libby - Mining Companies
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- Miscellaneous Agriculture, Libby
- Miscellaneous Government, Libby
- Miscellaneous Personal Services, Libby
- Miscellaneous Photographers, Libby
- Miscellaneous Professional, Libby
- Mission Churches, Libby
- Mobile Home Parks & Communities , Libby
- Monuments, Tombstones, Markers & Memorials, Libby
- Mortgages & Loans, Libby
- Motor Sports, Libby
- Motor Vehicle, Libby
- Motor Vehicle Rental & Leasing, Libby
- Motorcycle & Motor Scooters Dealers, Repair & Service, Libby
- Motorcycle Parts, Accessories & Dealers, Libby
- Motorcycle Repair & Service, Libby
- Movie Theaters, Libby
- Moving Truck Rental , Libby
- Muffler Shop & Exhaust Systems, Libby
- Museums, Libby
- Music, Libby
- Musical Instruments & Equipment Stores, Libby
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