| Postal Code | 438 01 |
| Postal Code Name | Žatec |
| Region | Ústecký Region |
| District | Louny District |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 270 04 270 06 430 01 431 14 431 43 431 44 431 45 431 53 431 54 431 57 432 01 434 01 439 31 439 49 439 63 439 65 439 68 439 69 439 75 439 86 439 87 439 88 440 01 441 01 |