First Interstate Bank: branch locations
First Interstate Bank is an FDIC-insured bank with 270 branches in 10 states in our list. Its main office address in the FDIC records is 401 N 31st St, Billings, MT 59101.
Contact details
| Main office | 401 N 31st St, Billings, MT 59101 |
|---|---|
| Official website | www.firstinterstatebank.com |
| FDIC certificate | 1105 |
The website address is the one the bank reported to the FDIC. Phone numbers are not part of the FDIC data, so use the number on your card or the bank’s own website.
Where First Interstate Bank has branches
| State | Branches |
|---|---|
| South Dakota | 45 |
| Iowa | 45 |
| Montana | 42 |
| Oregon | 33 |
| Nebraska | 28 |
| Idaho | 20 |
| Colorado | 19 |
| Washington | 17 |
| Wyoming | 15 |
| Missouri | 6 |
First Interstate Bank has too many branches to list on one page. Pick a state above to see every bank there, including this one.
Source: FDIC BankFind Suite, retrieved 2026-09-20. This site is independent and is not affiliated with First Interstate Bank. Confirm branch details with the bank.
Frequently asked questions
How many branches does First Interstate Bank have?
Our list has 270 branches of First Interstate Bank, in South Dakota (45), Iowa (45), Montana (42), Oregon (33), Nebraska (28) and Idaho (20) and more. The number changes as branches open and close.
Where is First Interstate Bank headquartered?
The FDIC lists the main office at 401 N 31st St, Billings, MT 59101.
Is First Interstate Bank FDIC-insured?
According to the FDIC BankFind data, First Interstate Bank is an active FDIC-insured institution (certificate number 1105). Confirm any bank you plan to use in the FDIC’s BankFind tool.