GNB Bank ← View details 529 G Avenue, Grundy Center, IA 50638 +1 319-824-5431 gnbbank.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 07:00 am — 05:00 pm Tuesday: 07:00 am — 05:00 pm Wednesday: 07:00 am — 05:00 pm Thursday: 07:00 am — 05:00 pm Friday: 07:00 am — 05:00 pm Saturday: 08:00 am — 12:00 pm Your comments * — Required information