| Zip Code | City | Population ↓ |
|---|---|---|
| 71241 | Farmerville | 8,045 |
| 71234 | Downsville | 5,069 |
| 71280 | Sterlington | 4,965 |
| 71260 | Marion | 2,931 |
| 71222 | Bernice | 2,801 |
| 71277 | Spearsville | 1,863 |
| 71256 | Lillie | 641 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Union Parish, Louisiana (US Census).