8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 78602 | Bastrop | 35,786 |
| 78621 | Elgin | 27,860 |
| 78612 | Cedar Creek | 19,830 |
| 78957 | Smithville | 10,282 |
| 78662 | Red Rock | 3,147 |
| 78659 | Paige | 2,898 |
| 78650 | McDade | 2,679 |
| 78953 | Rosanky | 958 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Bastrop County, Texas (US Census).