There are 13 zip codes in Johnson County, Iowa. The most populated is 52240, located in Iowa City. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5224036,475Iowa City
5224122,494Coralville
5224622,340Iowa City
5231722,119North Liberty
5224522,088Iowa City
523337,237Solon
522475,222Kalona
523405,192Tiffin
522424,140Iowa City
523383,886Swisher
527552,227Lone Tree
523221,913Oxford
52235889Hills

Zip Codes in Johnson County, Iowa by Population (2024)