Janesville ZIP Codes

List of Zip Codes of Janesville

The following table lists ZIP Codes associated with Janesville, Wisconsin, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.

About Janesville Wisconsin Zip Codes

The city of Janesville in Wisconsin (WI) is served by approximately 3 ZIP Codes. These codes cover residential neighborhoods, business districts, and surrounding localities that use the city name in their mailing address.

Based on ZIP-level population estimates, the combined population covered by these ZIP Codes is around 73,928 people. Population density can vary significantly from one ZIP Code to another, reflecting the mix of dense urban blocks, commercial corridors, and lower-density residential areas.

The ZIP Codes associated with Janesville fall within county jurisdictions such as Rock. Each county manages local services, land use, and administration for the areas corresponding to its ZIP Codes.

Most ZIP codes for Janesville, Wisconsin follow the America/Chicago time zone.