What is your mailing address/phone number? 3Rivers PO Box 2573 Fort Wayne, IN 46801-2573 260.490.8328 800.825.3641 You can also contact us online. Have more questions? Submit a request 0 Comments Article is closed for comments. Related articles Home Office Address What are your branch locations and hours? Mailing Address Call Back Will I receive a PIN (Personal Identification Number) so I can access cash with my debit card?