FDIC-insured bank
GNB Bank
Bank headquartered in Grundy Center, Iowa, part of GNB BCORP.
Source: FDIC BankFind Suite, data as of June 30, 2026, fetched September 5, 2026
Headquarters and contact
| Address | 529 G Ave Grundy Center, IA 50638 |
| County | Grundy |
| Metro area | Waterloo-Cedar Falls, IA |
| Website | www.gnbbank.com |
| Phone | not published in FDIC data, see the bank's website |
FDIC record
| FDIC Certificate | 14079 |
| Federal Reserve RSSD ID | 724744 |
| Status | Active |
| Charter class | SM (STATE) |
| Holding company | GNB BCORP |
| Domestic offices | 10 |
| Financials as of | June 30, 2026 |
Routing number
FDIC does not publish ABA routing numbers, and many banks use different routing numbers by state or by account type. The reliable places to find yours: the bottom left of a check from this bank, the "account details" screen in its online banking, or its official website at www.gnbbank.com.
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Offices nearest to headquarters
| Gnb Bank main office Grundy Center, IA |
529 G Ave, 50638 |
| Insurance & Investments Grundy Center, IA |
603 7th St, 50638 |
| Messenger Service Branch Conrad, IA |
103 E Center St, 50621 |
| Conrad Office Branch Conrad, IA |
103 E Center St, 50621 |
| Ackley Branch Ackley, IA |
308 Sherman Ave, 50601 |
| Marshalltown Branch Marshalltown, IA |
2504 S 2nd St, 50158 |
| Iowa Falls Downtown Branch Iowa Falls, IA |
315 Main St, 50126 |
| Timberland Village Branch Story City, IA |
725 Timberland Dr, 50248 |
| Story City Office Story City, IA |
629 Broad St, 50248 |
| Gnb Manchester Branch Manchester, IA |
300 E Main St, 52057 |