16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 63026 | Fenton | 45,267 |
| 63010 | Arnold | 34,405 |
| 63052 | Imperial | 28,741 |
| 63028 | Festus | 27,913 |
| 63020 | De Soto | 20,357 |
| 63050 | Hillsboro | 17,681 |
| 63049 | High Ridge | 17,480 |
| 63051 | House Springs | 12,589 |
| 63012 | Barnhart | 10,977 |
| 63070 | Pevely | 8,365 |
| 63016 | Cedar Hill | 6,291 |
| 63023 | Dittmer | 5,442 |
| 63019 | Crystal City | 4,490 |
| 63048 | Herculaneum | 4,143 |
| 63053 | Kimmswick | 60 |
| 63047 | Hematite | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Jefferson County, Missouri (US Census).