| First Interstate Bank - 7001 Jackrabbit Ln | Belgrade406-388-0917 | 406-388-0917 |
| First Interstate Bank - 8111 Montana Hwy 35 | Bigfork406-837-7200 | 406-837-7200 |
| First Interstate Bank - 401 North 31st Street | Billings406-255-5000 | 406-255-5000 |
| First Interstate Bank - 3199 Grand Avenue | Billings406-255-6090 | 406-255-6090 |
| First Interstate Bank - 730 Main Street | Billings406-255-5800 | 406-255-5800 |
| First Interstate Bank - 302 North 31st Street | Billings406-255-5290 | 406-255-5290 |
| First Interstate Bank - 2850 Old Hardin Rd | Billings406-237-1800 | 406-237-1800 |
| First Interstate Bank - 2501 Central Avenue | Billings406-255-6100 | 406-255-6100 |
| First Interstate Bank - 2800 West Main | Bozeman406-586-4555 | 406-586-4555 |
| First Interstate Bank - 202 West Main Street | Bozeman406-556-4900 | 406-556-4900 |
| First Interstate Bank - 2023 Burke Street | Bozeman406-556-1058 | 406-556-1058 |
| First Interstate Bank - 228 Strand Union Building | Bozeman406-586-0757 | 406-586-0757 |
| First Interstate Bank - 6210 Main Street | Colstrip406-748-2840 | 406-748-2840 |
| First Interstate Bank - 508 Highway 93 North | Eureka406-297-3116 | 406-297-3116 |
| First Interstate Bank - U.S. Route 89 North | Gardiner406-848-7400 | 406-848-7400 |
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| First Interstate Bank - 211 5th Street North | Great Falls406-454-6266 | 406-454-6266 |
| First Interstate Bank - 2601 10th Ave South | Great Falls406-454-6200 | 406-454-6200 |
| First Interstate Bank - 1401 Market Place Drive | Great Falls406-454-6300 | 406-454-6300 |
| First Interstate Bank - 1501 N First | Hamilton406-363-0900 | 406-363-0900 |
| First Interstate Bank - 402 North Center Avenue | Hardin406-665-3822 | 406-665-3822 |
| First Interstate Bank - 4th Street And Cody Avenue | Hardin406-665-3822 | 406-665-3822 |
| First Interstate Bank - 1600 11th Ave #121 | Helena406-457-7151 | 406-457-7151 |
| First Interstate Bank - 3401 North Montana Avenue | Helena406-457-7171 | 406-457-7171 |
| First Interstate Bank - 2 Main Street | Kalispell406-756-5200 | 406-756-5200 |
| First Interstate Bank - 100 East Cottonwood Drive | Kalispell406-758-7600 | 406-758-7600 |
| First Interstate Bank - 112 East Montana Street | Kalispell406-756-5200 | 406-756-5200 |
| First Interstate Bank - 100 Hutton Ranch Rd | Kalispell406-756-5222 | 406-756-5222 |
| First Interstate Bank - 502 Cheyenne Avneue | Lame Deer406-477-8911 | 406-477-8911 |
| First Interstate Bank - 207 West Callendar | Livingston406-222-2950 | 406-222-2950 |
| First Interstate Bank - 1115 Main Street | Miles City406-232-5590 | 406-232-5590 |
| First Interstate Bank - 301 East Front Street | Missoula406-523-4200 | 406-523-4200 |
| First Interstate Bank - 3800 South Russell | Missoula406-523-4200 | 406-523-4200 |
| First Interstate Bank - 3502 Brooks | Missoula406-523-4200 | 406-523-4200 |
| First Interstate Bank - 2500 North Reserve | Missoula406-523-4200 | 406-523-4200 |
| First Interstate Bank - 101 East Front Street | Missoula406-523-4200 | 406-523-4200 |
| First Interstate Bank - Main Street | Polson406-883-7731 | 406-883-7731 |
| First Interstate Bank - 602 North Broadway | Red Lodge406-446-1422 | 406-446-1422 |
| First Interstate Bank - 306 Spokane Avenue | Whitefish406-863-8888 | 406-863-8888 |
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