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
City
Population
71730El Dorado29,287
71762Smackover2,988
71749Junction City2,886
71765Strong2,344
71747Huttig821
71759Norphlet387
71724Calion308
71758Mount Holly194

Union County, Arkansas Zip Codes by Population (2024)