There are 17 zip codes in Jefferson County, Missouri. The most populated is 63010, located in Arnold. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
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
63030289Fletcher
63041251Grubville
6305367Kimmswick
63047Hematite
showing: 17 rows

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