First Financial Bank, Westerville Branch Basic Info Reviews Routing Numbers Map & Direction Name: First Financial Bank, Westerville Branch Main Office: No Service: Full Service Brick and Mortar Office Location: 780 South State Street Westerville, Ohio 43081 Franklin County View other branches Phone: 614-776-5300 Please enable JavaScript to view the comments powered by Disqus. Routing NumberProcess ACH TransferProcess Wire Transfer041210985YN042202264YN From: To: