- Machine Shop & Tool Repair Service, Bayfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Bayfield
- Management Consultants & Services, Bayfield
- Manufacturing, Bayfield
- Marinas & Marina Services, Bayfield
- Marine Products And Services, Bayfield
- Marine Services, Bayfield
- Marriage & Family Counselors, Bayfield
- Masonry Materials & Supplies, Bayfield
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- Membership Sports & Recreation Clubs, Bayfield
- Mental Health Specialists, Bayfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Bayfield
- Miscellaneous Business Services, Bayfield
- Miscellaneous Government, Bayfield
- Motor Vehicle, Bayfield
- Movie Theaters, Bayfield
- Museums, Bayfield
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