- Machine Shop & Tool Repair Service, Collinsville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Collinsville
- Management Consultants & Services, Collinsville
- Manicurists & Pedicurists, Collinsville
- Manufacturing, Collinsville
- Masonry Materials & Supplies, Collinsville
- Massage Therapy, Collinsville
- Meeting & Event Planning Services, Collinsville - Conference Consultants
- Mini & Self Storage, Collinsville
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