11 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 27520 | Clayton | 48,014 |
| 27527 | Clayton | 39,256 |
| 27577 | Smithfield | 28,354 |
| 27576 | Selma | 21,624 |
| 27504 | Benson | 17,079 |
| 27524 | Four Oaks | 13,999 |
| 27542 | Kenly | 9,850 |
| 27569 | Princeton | 8,833 |
| 27568 | Pine Level | 1,542 |
| 27555 | Micro | 573 |
| 27593 | Wilsons Mills | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Johnston County, North Carolina (US Census).