Cities in St. Clair County, Illinois
Find ZIP Codes and postal details for St. Clair County, Illinois.

Belleville

Caseyville

Dupo

East Carondelet

East Saint Louis

Fairview Heights

Freeburg

Lebanon

Lenzburg

Lovejoy

Marissa

Mascoutah

Millstadt

National Stock Yards

New Athens

O Fallon

Saint Libory

Scott Air Force Base

Smithton

Summerfield