4 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 29379 | Union | 17,580 |
| 29353 | Jonesville | 3,627 |
| 29321 | Buffalo | 3,147 |
| 29364 | Lockhart | 525 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Union County, South Carolina (US Census).