5 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 77833 | Brenham | 28,884 |
| 77835 | Burton | 2,912 |
| 77426 | Chappell Hill | 2,086 |
| 77880 | Washington | 2,041 |
| 78932 | Carmine | 486 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 5 ZCTAs in Washington County, Texas (US Census).