| Zip Code | City | Population ↓ |
|---|---|---|
| 29379 | Union | 17,380 |
| 29353 | Jonesville | 3,483 |
| 29321 | Buffalo | 3,248 |
| 29364 | Lockhart | 557 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 4 ZCTAs in Union County, South Carolina (US Census).