28 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 18102 | Allentown | 51,315 |
| 18104 | Allentown | 47,999 |
| 18103 | Allentown | 47,336 |
| 18018 | Bethlehem | 32,253 |
| 18052 | Whitehall | 29,271 |
| 18062 | Macungie | 26,633 |
| 18049 | Emmaus | 18,693 |
| 18109 | Allentown | 18,117 |
| 18036 | Coopersburg | 14,625 |
| 18031 | Breinigsville | 12,031 |
| 18080 | Slatington | 11,489 |
| 18034 | Center Valley | 9,501 |
| 18032 | Catasauqua | 9,459 |
| 18069 | Orefield | 8,804 |
| 18078 | Schnecksville | 7,571 |
| 18037 | Coplay | 7,459 |
| 18106 | Allentown | 6,437 |
| 18066 | New Tripoli | 5,837 |
| 18101 | Allentown | 5,789 |
| 18051 | Fogelsville | 3,252 |
| 18092 | Zionsville | 3,246 |
| 18053 | Germansville | 2,400 |
| 18087 | Trexlertown | 609 |
| 18059 | Laurys Station | 547 |
| 18065 | Neffs | 444 |
| 18079 | Slatedale | 353 |
| 18046 | East Texas | 144 |
| 18195 | Allentown | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 28 ZCTAs in Lehigh County, Pennsylvania (US Census).