There are 13 zip codes in Rock County, Wisconsin. The most populated is 53511, located in Beloit. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5351148,749Beloit
5354629,352Janesville
5354524,037Janesville
5354820,119Janesville
5353412,306Edgerton
5356311,587Milton
535369,073Evansville
535206,709Brodhead
535254,024Clinton
535762,359Orfordville
53537871Footville
53505368Avalon
53501249Afton

Zip Codes in Rock County, Wisconsin by Population (2024)