7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 78644 | Lockhart | 20,088 |
| 78616 | Dale | 8,821 |
| 78648 | Luling | 8,250 |
| 78655 | Martindale | 3,671 |
| 78656 | Maxwell | 2,631 |
| 78661 | Prairie Lea | 437 |
| 78622 | Fentress | 353 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Caldwell County, Texas (US Census).