- Machine Shop & Tool Repair Service, Otsego
- Machinery, Supplies & Equipment - Business Production Related, Otsego
- Machinery, Supplies & Equipment - Business Supplies Related, Otsego
- Machinery, Supplies & Equipment - Construction & Contractor Related, Otsego
- Management Consultants & Services, Otsego
- Manufacturing, Otsego
- Manufacturing Products, Otsego
- Masonry Materials & Supplies, Otsego
- Metal Products, Otsego
- Metal Products, Otsego
- Methodist Church, Otsego
- Mexican Restaurants, Otsego
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- Mini & Self Storage, Otsego
- Mirrors, Otsego - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Services, Otsego
- Miscellaneous Government, Otsego
- Miscellaneous Manufacturing, Otsego
- Miscellaneous Professional, Otsego
- Mobile Home Parks & Communities , Otsego
- Molds, Otsego
- Motor Vehicle, Otsego
- Museums, Otsego
- Music, Otsego
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