There are 9 zip codes in Grundy County, Iowa. The most populated is 50638, located in Grundy Center. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
506383,330Grundy Center
506692,358Reinbeck
506241,694Dike
506211,641Conrad
506801,124Wellsburg
50642498Holland
50609381Beaman
50673245Stout
50657122Morrison

Zip Codes in Grundy County, Iowa by Population (2024)