There are 16 zip codes in Jefferson County, Missouri. The most populated is 63026, located in Fenton. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6302644,824Fenton
6301034,744Arnold
6305228,716Imperial
6302828,276Festus
6302020,282De Soto
6305017,588Hillsboro
6304917,455High Ridge
6305112,181House Springs
6301210,763Barnhart
630708,569Pevely
630166,341Cedar Hill
630235,123Dittmer
630194,489Crystal City
630484,024Herculaneum
6305367Kimmswick
630470Hematite

Zip Codes in Jefferson County, Missouri by Population (2024)