- Machinery, Supplies & Equipment - Business Supplies Related, Roscommon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Roscommon
- Mail Delivery Service, Roscommon
- Manufacturing, Roscommon
- Manufacturing Products, Roscommon
- Marinas & Marina Services, Roscommon
- Masonry Materials & Supplies, Roscommon
- Medical Groups & Clinics, Roscommon - Medical & Health Centers
- Membership Sports & Recreation Clubs, Roscommon
- Mental Health Specialists, Roscommon - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Roscommon
- Miscellaneous Business Product Repair, Roscommon
- Miscellaneous Agriculture, Roscommon
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- Miscellaneous Government, Roscommon
- Miscellaneous Professional, Roscommon
- Mobile Home Parks & Communities , Roscommon
- Mortgage Bankers & Correspondents, Roscommon
- Mortgage Companies, Roscommon
- Mortgage Contracts & Services, Roscommon
- Motor Vehicle, Roscommon
- Motor Vehicle Rental & Leasing, Roscommon
- Moving Supplies & Equipment Rental, Roscommon
- Moving Truck Rental , Roscommon
- Muffler Shop & Exhaust Systems, Roscommon
- Museums, Roscommon
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