The First, A National Banking Association, Diamondhead Branch Basic Info Reviews Routing Numbers Map & Direction Name: The First, A National Banking Association, Diamondhead Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 4402 Kalani Drive Diamondhead, Mississippi 39525 Hancock County View other branches Phone: 228-463-2120 Please enable JavaScript to view the comments powered by Disqus. From: To: