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
City
Population
63026Fenton44,824
63010Arnold34,744
63052Imperial28,716
63028Festus28,276
63020De Soto20,282
63050Hillsboro17,588
63049High Ridge17,455
63051House Springs12,181
63012Barnhart10,763
63070Pevely8,569
63016Cedar Hill6,341
63023Dittmer5,123
63019Crystal City4,489
63048Herculaneum4,024
63053Kimmswick67
63047Hematite0

Jefferson County, Missouri Zip Codes by Population (2024)