There are 8 zip codes in Union County, Ohio. The most populated is 43040, located in Marysville. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4304036,678Marysville
433446,119Richwood
433582,608West Mansfield
430451,775Milford Center
430671,360Raymond
43036306Magnetic Springs
43077277Unionville Center
4300743Broadway

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