28 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 18102 | Allentown | 51,001 |
| 18103 | Allentown | 48,746 |
| 18104 | Allentown | 48,683 |
| 18018 | Bethlehem | 32,965 |
| 18052 | Whitehall | 29,451 |
| 18062 | Macungie | 27,110 |
| 18049 | Emmaus | 18,941 |
| 18109 | Allentown | 18,446 |
| 18036 | Coopersburg | 15,581 |
| 18031 | Breinigsville | 11,570 |
| 18080 | Slatington | 11,226 |
| 18032 | Catasauqua | 9,555 |
| 18034 | Center Valley | 9,209 |
| 18069 | Orefield | 8,515 |
| 18078 | Schnecksville | 7,857 |
| 18037 | Coplay | 7,472 |
| 18106 | Allentown | 6,226 |
| 18101 | Allentown | 6,120 |
| 18066 | New Tripoli | 6,102 |
| 18051 | Fogelsville | 3,624 |
| 18092 | Zionsville | 3,230 |
| 18053 | Germansville | 2,344 |
| 18059 | Laurys Station | 744 |
| 18087 | Trexlertown | 590 |
| 18065 | Neffs | 577 |
| 18079 | Slatedale | 303 |
| 18046 | East Texas | 201 |
| 18195 | Allentown | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 28 ZCTAs in Lehigh County, Pennsylvania (US Census).