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GNB Bank branch locations

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10 complete locations Updated August 2, 2026

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Largest local footprints

Cities with the most GNB Bank locations

Conrad, Iowa2 locations Grundy Center, Iowa2 locations Story City, Iowa2 locations Ackley, Iowa1 locations Iowa Falls, Iowa1 locations Manchester, Iowa1 locations Marshalltown, Iowa1 locations

Locations

All listed branches

10 results

Ackley Branch

308 Sherman Ave, Ackley, Iowa, 50601

Full-service branch · Opened December 31, 1933

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Conrad Office

103 E Center St, Conrad, Iowa, 50621

Full-service branch · Opened December 1, 2005

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Insurance & Investments

603 7th St, Grundy Center, Iowa, 50638

Limited Service: Administrative · Opened September 30, 1906

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Iowa Falls Downtown

315 Main St, Iowa Falls, Iowa, 50126

Full-service branch · Opened May 3, 2012

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Main Office

529 G Ave, Grundy Center, Iowa, 50638

Full-service branch · Opened March 15, 1934

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Manchester Branch

300 E Main St, Manchester, Iowa, 52057

Full-service branch · Opened January 1, 1945

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Marshalltown Branch

2504 S 2nd St, Marshalltown, Iowa, 50158

Full-service branch · Opened December 2, 2012

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Messenger Service

103 E Center St, Conrad, Iowa, 50621

Limited Service: Messenger · Opened May 31, 2005

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Story City Office

629 Broad St, Story City, Iowa, 50248

Full-service branch · Opened July 25, 2004

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Timberland Village

725 Timberland Dr, Story City, Iowa, 50248

Mobile or seasonal office · Opened January 14, 2008

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