| Zip Code | City | Population ↓ |
|---|---|---|
| 27520 | Clayton | 46,059 |
| 27527 | Clayton | 34,321 |
| 27577 | Smithfield | 26,778 |
| 27576 | Selma | 20,011 |
| 27504 | Benson | 15,057 |
| 27524 | Four Oaks | 13,976 |
| 27542 | Kenly | 9,610 |
| 27569 | Princeton | 8,963 |
| 27568 | Pine Level | 1,509 |
| 27555 | Micro | 477 |
| 27593 | Wilsons Mills | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 11 ZCTAs in Johnston County, North Carolina (US Census).