There are 13 zip codes in St. Charles County, Missouri. The most populated is 63376, located in St. Peters. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6337674,967St. Peters
6336652,746O Fallon
6330151,401St. Charles
6338548,535Wentzville
6330347,285St. Charles
6330442,738St. Charles
6336727,371Lake St. Louis
6334810,555Foristell
633413,628Defiance
633321,742Augusta
63373687Portage Des Sioux
63386522West Alton
6336566New Melle
showing: 13 rows

Zip Codes in St. Charles County, Missouri by Population (2024)