First Interstate BancSystem Routing Number: Montana Banking Guide

What is the First Interstate BancSystem routing number?

The First Interstate BancSystem routing number is 092901683. This routing number is used for ACH transfers, direct deposits, and electronic fund transfers at First Interstate Bank, the banking subsidiary of First Interstate BancSystem.

First Interstate BancSystem is headquartered in Billings, Montana, and operates branches across Montana, Wyoming, South Dakota, Idaho, Washington, Oregon, Nebraska, Iowa, Kansas, and Arizona. The company significantly expanded through its 2022 acquisition of Great Western Bank.

How to find your First Interstate routing number

Routing number 092901683 is printed on the bottom-left of your First Interstate Bank checks. Note that First Interstate may use different routing numbers depending on the state where your account was opened.

Verify your specific routing number through First Interstate Bank online banking, the mobile app, or by contacting customer service. Former Great Western Bank customers should confirm their assigned routing number.

First Interstate direct deposit and ACH

Set up direct deposit by providing routing number 092901683 and your account number to your employer or benefits provider. First Interstate Bank processes payroll deposits, tax refunds, and government benefit payments.

ACH transfers through First Interstate Bank typically process within one to three business days. The bank supports both personal and commercial electronic transfers across its multi-state branch network.

First Interstate wire transfers

Domestic wire transfers at First Interstate Bank use routing number 092901683 for Montana-based accounts. Contact your local branch for wire transfer cutoff times, same-day processing availability, and applicable fees.

International wire transfers are available through First Interstate Bank with a SWIFT code and additional beneficiary information. Branch staff can provide complete international wire instructions.

Business banking with Slash

First Interstate BancSystem serves businesses across the western United States with traditional banking products. For companies that need digital-first financial tools, Slash provides instant ACH and wire transfers, unlimited virtual cards, and automated expense management.

Slash offers businesses real-time financial visibility, multi-entity support, up to 2% cashback on card spend, and seamless integrations with QuickBooks and Xero for efficient operations.