16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 16101 | New Castle | 30,960 |
| 16117 | Ellwood City | 16,013 |
| 16105 | New Castle | 15,195 |
| 16102 | New Castle | 4,933 |
| 16156 | Volant | 3,385 |
| 16116 | Edinburg | 2,783 |
| 16157 | Wampum | 2,759 |
| 16120 | Enon Valley | 2,185 |
| 16143 | Pulaski | 1,995 |
| 16141 | New Galilee | 1,901 |
| 16112 | Bessemer | 1,431 |
| 16160 | West Pittsburg | 949 |
| 16172 | New Wilmington | 899 |
| 16140 | New Bedford | 386 |
| 16132 | Hillsville | 370 |
| 16155 | Villa Maria | 94 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Lawrence County, Pennsylvania (US Census).