There are 28 zip codes in Lehigh County, Pennsylvania. The most populated is 18102, located in Allentown. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
18102Allentown51,640
18103Allentown48,344
18104Allentown46,259
18018Bethlehem31,479
18052Whitehall29,286
18062Macungie26,722
18049Emmaus18,727
18109Allentown17,745
18036Coopersburg14,532
18031Breinigsville12,337
18080Slatington11,251
18032Catasauqua9,468
18034Center Valley9,228
18069Orefield8,593
18078Schnecksville7,543
18037Coplay7,360
18106Allentown6,759
18101Allentown5,673
18066New Tripoli5,612
18051Fogelsville3,390
18092Zionsville3,078
18053Germansville2,565
18087Trexlertown762
18059Laurys Station728
18079Slatedale550
18065Neffs271
18046East Texas142
18195Allentown0
showing: 28 rows

Lehigh County, Pennsylvania Zip Codes by Population (2024)