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
Population
City
1783718,670Lewisburg
1784410,227Mifflinburg
178563,107New Columbia
178452,051Millmont
17887810White Deer
17855793New Berlin
17886657West Milton
17829244Hartleton
17885221Weikert
17835162Laurelton
1788046Swengel

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