There are 4 zip codes in Union County, Kentucky. The most populated is 42437, located in Morganfield. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
424377,419Morganfield
424593,935Sturgis
424621,512Waverly
424611,050Uniontown

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