The First, A National Banking Association, Siegen Lane Branch Basic Info Reviews Routing Numbers Map & Direction Name: The First, A National Banking Association, Siegen Lane Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 9250 Siegen Lane Baton Rouge, Louisiana 70810 East Baton Rouge County View other branches Please enable JavaScript to view the comments powered by Disqus. From: To: