There are 11 zip codes in Union County, Pennsylvania. The most populated is 17837, located in Lewisburg. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
17837Lewisburg18,670
17844Mifflinburg10,227
17856New Columbia3,107
17845Millmont2,051
17887White Deer810
17855New Berlin793
17886West Milton657
17829Hartleton244
17885Weikert221
17835Laurelton162
17880Swengel46

Union County, Pennsylvania Zip Codes by Population (2024)