Contact Us

At FSNB, we are available to our customers all across the world in the way you feel most comfortable contacting us. Feel free to contact us about any questions, needs or concerns you may have.

Live Customer Service

  • Phone: 1-800-749-4583 or 1-580-357-9880
  • Monday – Friday 6:00 am – 8:00 pm CST
    Saturdays 7:00 am – 4:00 pm CST
    Closed on Sunday and Federal Holidays

Secure Messaging

  1. Log in to your Online Banking
  2. Click on the Menu bar at the top left corner of the page
  3. Click on Messages icon
  4. Click on “create a message

Live Chat

  1. Log in to your Online Banking
  2. Click on the Menu bar at the top left corner of the page
  3. Click on the Chat icon
  4. Fill out the required fields and click on submit
  • Monday – Friday 6:00 am – 8:00 pm CST
    Saturdays 7:00 am – 4:00 pm CST
    Closed on Sunday and Federal Holidays

Email

General inquiries only. Please do not send account number, social security number, or other sensitive account information. For account information please log in to your online banking session and choose the Secure message option.

Veterans

A personal military assistant is ready to assist you! Please do not send account number, social security number, or other sensitive account information. For account information please log in to your online banking session and choose the Secure message option.

By Mail

  • FSNB N.A.
    Box 33009
    Fort Sill, Oklahoma 73503-009

Bank By Phone

IVR (Interactive Voice Response)
  • Phone: 1-800-355-2140 or 1-580-355-2184
  • Hear account balances
  • Hear account transactions
  • Hear of pending deposits
  • Set up a new PIN #
  • Report your Visa debit card lost or stolen
  • Transfer funds between your FSNB accounts
  • Increase your daily card spending limit and so much more!

Phone Numbers

  • United States:
    1 (580) 357-9880
    1 (800) 749-4583
    Fax: 1 (580) 355-0641
  • United Kingdom:
    08-082346114
  • Germany:
    0800-1821262
  • Korea:
    00798-14-800-1195
  • Japan:
    0066-33-813302