Reliance Bank, O'fallon Branch Basic Info Reviews Routing Numbers Map & Direction Name: Reliance Bank, O'fallon Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 2455 Highway K O Fallon, Missouri 63368 St. Charles County View other branches Phone: 636-978-1710 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer067092679YN081018888YY081019227YN081025761YN From: To: