There are 27 zip codes in St. Clair County, Illinois. The most populated is 62269, located in O Fallon. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6226935,467O Fallon
6222129,454Belleville
6222629,333Belleville
6222019,277Belleville
6220816,690Fairview Heights
6222316,534Belleville
6220613,477East Saint Louis
6225810,572Mascoutah
622326,920Caseyville
622076,637East Saint Louis
622546,586Lebanon
622606,461Millstadt
622436,271Freeburg
622036,076East Saint Louis
622045,908East Saint Louis
622055,754East Saint Louis
622255,359Scott Air Force Base
622015,166East Saint Louis
622854,512Smithton
622394,076Dupo
622643,237New Athens
622402,197East Carondelet
622571,897Marissa
622551,030Lenzburg
62282646Saint Libory
62059629Lovejoy
62289397Summerfield
showing: 27 rows

Zip Codes in St. Clair County, Illinois by Population (2024)