There are 8 zip codes in Grundy County, Illinois. The most populated is 60450, located in Morris. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6045020,729Morris
604169,372Coal City
604242,309Gardner
604441,928Mazon
604071,581Braceville
60474684South Wilmington
60479676Verona
6043788Kinsman

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