Jefferson County, Missouri
16 ZIP codes · 656.26 sq mi of land · FIPS 29099
| Population | 229,458 |
|---|---|
| State | Missouri |
| FIPS code | 29099 |
| Time zone | Central |
| Land area | 656.26 sq mi |
| Center (lat, long) | 38.2576, -90.5437 |
Area codes in this area
These are the area codes that most often serve Jefferson County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Arnold · 20,956BarnhartCedar HillCrystal CityDe SotoDittmerFentonFestusHematiteHerculaneumHigh RidgeHillsboroHouse SpringsImperialKimmswickPevely
ZIP codes in Jefferson County
63010 Arnold63012 Barnhart63016 Cedar Hill63019 Crystal City63020 De Soto63023 Dittmer63026 Fenton63028 Festus63047 Hematite63048 Herculaneum63049 High Ridge63050 Hillsboro63051 House Springs63052 Imperial63053 Kimmswick63070 Pevely
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.