There are 6 zip codes in Union County, Iowa. The most populated is 50801, located in Creston. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
508018,957Creston
508301,969Afton
50861309Shannon City
50254288Thayer
5084273Cromwell
5083129Arispe

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