NSB Bank Stores by States Outlet Note Regular Brands NSB Bank Rating 4.5 based on 95 votes Official Website http://www.nsbbank.com/ Products Banking Savings Saving Bank Saving Plans Browse by State Iowa Browse Major Regular Stores NSB Bank outlet - Mason City 2650 4th St Sw (641) 423-7638 NSB Bank outlet - Mason City 451 S Illinois Ave (641) 423-1432 NSB Bank outlet - Northwood 900 Central Ave (641) 324-1023 People Also Viewed