Illinois National Bank, South Sixth Street Branch Basic Info Reviews Routing Numbers Map & Direction Name: Illinois National Bank, South Sixth Street Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 2849 South Sixth Street Springfield, Illinois 62703 Sangamon County View other branches Phone: 217-747-8550 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer071107233YY071108355YN071109338YY081225707YN From: To: