GNB Bank, Marshalltown Branch Basic Info Reviews Routing Numbers Map & Direction Name: GNB Bank, Marshalltown Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 2504 South 2nd Street Marshalltown, Iowa 50158 Marshall County View other branches Phone: 641-753-4040 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer073905064YY073905352YN073921970YN From: To:
