- Machine Shop & Tool Repair Service, Douglas
- Manufacturing, Douglas
- Marriage & Family Counselors, Douglas
- Masonry Contractors, Douglas - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Douglas
- Membership Sports & Recreation Clubs, Douglas
- Mental Health Specialists, Douglas - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Douglas
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