There are 8 zip codes in Union County, Arkansas. The most populated is 71730, located in El Dorado. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
7173029,287El Dorado
717622,988Smackover
717492,886Junction City
717652,344Strong
71747821Huttig
71759387Norphlet
71724308Calion
71758194Mount Holly

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