- Machine Shop & Tool Repair Service, Millbrook
- Machinery, Supplies & Equipment - Business Supplies Related, Millbrook
- Machinery, Supplies & Equipment - Construction & Contractor Related, Millbrook
- Management Consultants & Services, Millbrook
- Manicurists & Pedicurists, Millbrook
- Manufacturing, Millbrook
- Marriage & Family Counselors, Millbrook
- Masonry Materials & Supplies, Millbrook
- Membership Sports & Recreation Clubs, Millbrook
- Mental Health Clinics, Millbrook - Treatment Centers
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- Mental Health Specialists, Millbrook - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Specialties, Millbrook
- Methodist Church, Millbrook
- Mini & Self Storage, Millbrook
- Miscellaneous Agriculture, Millbrook
- Miscellaneous Government, Millbrook
- Miscellaneous Personal Services, Millbrook
- Monuments, Tombstones, Markers & Memorials, Millbrook
- Motor Vehicle, Millbrook
- Moving Companies, Millbrook
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