16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 63026 | Fenton | 45,354 |
| 63010 | Arnold | 34,478 |
| 63052 | Imperial | 28,712 |
| 63028 | Festus | 28,457 |
| 63020 | De Soto | 20,166 |
| 63050 | Hillsboro | 18,744 |
| 63049 | High Ridge | 16,592 |
| 63051 | House Springs | 13,436 |
| 63012 | Barnhart | 10,314 |
| 63070 | Pevely | 8,428 |
| 63016 | Cedar Hill | 6,459 |
| 63023 | Dittmer | 5,002 |
| 63019 | Crystal City | 4,489 |
| 63048 | Herculaneum | 4,228 |
| 63053 | Kimmswick | 56 |
| 63047 | Hematite | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Jefferson County, Missouri (US Census).