O’Fallon
ZIP Code(s): 62269; County(s): St. Clair;
St. Clair
Collinsville
ZIP Code(s): 62234; County(s): Madison, St. Clair;
Dupo
ZIP Code(s): 62240, 62236, 62239; County(s): St. Clair;
Centreville
ZIP Code(s): 62207, 62205, 62203; County(s): St. Clair;
Swansea
ZIP Code(s): 62226; County(s): St. Clair;
Osceola
ZIP Code(s): 64776; County(s): St. Clair;
Trussville
ZIP Code(s): 35235, 35173; County(s): Jefferson, St. Clair;
Leeds
ZIP Code(s): 35094, 35173; County(s): Jefferson, St. Clair, Shelby;
New Athens
ZIP Code(s): 62264; County(s): St. Clair;
Memphis
ZIP Code(s): 48041; County(s): Macomb, St. Clair;
Marissa
ZIP Code(s): 62257; County(s): St. Clair;
Capac
ZIP Code(s): 48014; County(s): St. Clair;
East St. Louis
ZIP Code(s): 62207, 62205, 62204, 62203, 62201, 62202; County(s): St. Clair;
Ashville
ZIP Code(s): 35953, 35987; County(s): St. Clair;
Madison
ZIP Code(s): 62040, 62201, 62060; County(s): Madison, St. Clair;
Alorton
ZIP Code(s): 62207, 62205; County(s): St. Clair;
Marine City
ZIP Code(s): 48039; County(s): St. Clair;
Port Huron
ZIP Code(s): 48060, 48061; County(s): St. Clair;
Millstadt
ZIP Code(s): 62260; County(s): St. Clair;
Argo
ZIP Code(s): 35173, 35120; County(s): Jefferson, St. Clair;