There are 12 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
523405,192Tiffin
522424,140Iowa City
523383,886Swisher
527552,227Lone Tree
523221,913Oxford
52235889Hills
showing: 12 rows

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