1st Source Bank, Portage Avenue Branch Basic Info Reviews Routing Numbers Map & Direction Name: 1st Source Bank, Portage Avenue Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 3655 Portage Avenue South Bend, Indiana 46628 St Joseph County View other branches Phone: 574-271-3130 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer071202756YY071212128YY From: To: