- Machinery, Supplies & Equipment - Business Supplies Related, Great Falls
- Malls & Shopping Centers, Great Falls
- Management Consultants & Services, Great Falls
- Manicurists & Pedicurists, Great Falls
- Manufacturing, Great Falls
- Map Publishers & Printers, Great Falls
- Mapping & Topographical Services, Great Falls
- Market Research & Analysis , Great Falls - Market Analysis, Business & Economic Research
- Martial Arts & Self Defense Schools, Great Falls
- Masonry Contractors, Great Falls - Stone Mason, Brick Mason - Install & Repair
- Masonry Panels Prefabricated, Great Falls
- Meat Market, Wholesale & Products, Great Falls
- Medical & Dental Management, Great Falls
- Medical & Health Service Organizations, Great Falls
- Medical Diagnostic Clinics, Great Falls - Clinical Labs & Centers
- Medical Research, Great Falls
- Medical Research & Development, Great Falls - Medical Information & Research
- Mediterranean Restaurants, Great Falls
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- Membership Sports & Recreation Clubs, Great Falls
- Mental Health Specialists, Great Falls - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Great Falls
- Middle Eastern Restaurants, Great Falls
- Mining, Great Falls
- Miscellaneous Household Item Repair, Great Falls
- Miscellaneous Business Services, Great Falls
- Miscellaneous Government, Great Falls
- Miscellaneous Personal Services, Great Falls
- Miscellaneous Photographers, Great Falls
- Miscellaneous Professional, Great Falls
- Mortgage Bankers & Correspondents, Great Falls
- Mortgage Contracts & Services, Great Falls
- Mortgages & Loans, Great Falls
- Motion Picture Pre & Post Production Services, Great Falls
- Motor Vehicle, Great Falls
- Motorcycle Parts, Accessories & Dealers, Great Falls
- Moving Companies, Great Falls
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