Northwest Bank Address: 3307 Highway 71, Spirit Lake, IA 51360 Phone: (712) 336-2181 Banks Other Businesses: Northwest Federal Savings Bank at 1109 18th St, Spirit Lake, IA 51360 Bank Midwest at 1525 18th St, Spirit Lake, IA 51360 Bank Midwest at 1507 18th St, Spirit Lake, IA 51360 Central Bank at 1400 18th St, Spirit Lake, IA 51360