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Customer Service - 855-660-5862 Online and Mobile Banking - 888-588-2623 To contact a First Financial Bank customer service representative, call toll-free 855-660-5862.
Routing Number for First Financial Bank NA (www.first-online.com) in IN and IL (for all transaction types) is 074900356. Routing Number for First Financial Bank NA (www.bankatfirst.com) in IN, KY and OH (for all transaction types) is 042200910. **Address mentioned in the table may differ from your branch office address.