Southern Michigan Bank & Trust, Marshall Branch Basic Info Reviews Routing Numbers Map & Direction Name: Southern Michigan Bank & Trust, Marshall Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 1110 West Michigan Avenue Marshall, Michigan 49068 Calhoun County View other branches Phone: 269-781-8500 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer072402283YY072402610YY072414459YN From: To: