There are 10 zip codes in Jefferson County, Wisconsin. The most populated is 53538, located in Fort Atkinson. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5353818,535Fort Atkinson
5309418,507Watertown
535499,902Jefferson
535519,417Lake Mills
535945,059Waterloo
530384,323Johnson Creek
531563,433Palmyra
530363,140Ixonia
531782,749Sullivan
531371,490Helenville

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