FDIC-insured bank
GNB Bank — Grundy Center, IA
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 |
How to find your GNB Bank 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 |
Where GNB Bank has offices
Cities with the most GNB Bank offices
Largest banks headquartered elsewhere in Iowa
| Principal Bank Des Moines | $9.84 billion |
| Bankers Trust Company Des Moines | $7.83 billion |
| Hills Bank and Trust Company Hills | $4.79 billion |
| West Bank West Des Moines | $4.03 billion |
| Northwest Bank Spencer | $3 billion |
| Cedar Rapids Bank and Trust Company Cedar Rapids | $2.90 billion |
| Quad City Bank and Trust Company Bettendorf | $2.77 billion |
| Fidelity Bank & Trust Dubuque | $2.60 billion |
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