- Machine Shop & Tool Repair Service, Breckenridge
- Machinery, Supplies & Equipment - Business Supplies Related, Breckenridge
- Management Consultants & Services, Breckenridge
- Manufacturing, Breckenridge
- Manufacturing Products, Breckenridge
- Marriage & Family Counselors, Breckenridge
- Martial Arts & Self Defense Schools, Breckenridge
- Massage Therapists & Professional, Breckenridge
- Massage Therapy, Breckenridge
- Mechanical Contractors, Breckenridge - Install, Service & Repair
- Membership Sports & Recreation Clubs, Breckenridge
- Mental Health Specialists, Breckenridge - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Breckenridge
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- Miscellaneous Agriculture, Breckenridge
- Miscellaneous Business Services, Breckenridge
- Miscellaneous Government, Breckenridge
- Miscellaneous Professional, Breckenridge
- Mobile Home Parks & Communities , Breckenridge
- Monuments, Tombstones, Markers & Memorials, Breckenridge
- Mortgage Bankers & Correspondents, Breckenridge
- Mortgage Contracts & Services, Breckenridge
- Motor Vehicle, Breckenridge
- Motorcycle & ATV Repair & Service, Breckenridge
- Motorcycle & Motor Scooters Dealers, Repair & Service, Breckenridge
- Motorcycle Repair & Service, Breckenridge
- Museums, Breckenridge
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