SunTrust Bank, Muddy Branch Basic Info Reviews Routing Numbers Map & Direction Name: SunTrust Bank, Muddy Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 800 Muddy Br Road Gaithersburg, Maryland 20878 Montgomery County View other branches Phone: 240-631-3000 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer051000020YN053100465YN055002707YN061000104YY061100790YN063102152YN063106750YN064000046YN084006952YN From: To: