Grundy County, Illinois ZIP Codes

8 ZIP Codes

Zip Code
City
Population ↓
60450Morris20,783
60416Coal City9,550
60424Gardner2,153
60444Mazon1,901
60407Braceville1,812
60479Verona671
60474South Wilmington663
60437Kinsman117

Overview of ZIP Codes in Grundy County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
8
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 8 ZCTAs in Grundy County, Illinois (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

Recommended Reading