GNB Bank and Insurance ← View details 2504 South 2nd Street, Marshalltown, IA 50158 +1 641-753-4040 gnbbank.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 08:30 am — 04:30 pm Tuesday: 08:30 am — 04:30 pm Wednesday: 08:30 am — 04:30 pm Thursday: 08:30 am — 04:30 pm Friday: 08:30 am — 04:30 pm Saturday: 08:00 am — 10:00 am Your comments * — Required information