First Interstate Bank Address: 6210 Main St, Colstrip, MT 59323 Phone: (406) 748-4455 Banks Other Businesses: Great Western Bank at 3 Cornflower CT, Colstrip, MT 59323 Super 8 at 6227 Main St, Colstrip, MT 59323 Subway at 6270 Main St, Colstrip, MT 59323 Subway at 6270 Main St, Colstrip, MT 59323