Template:St. Clair County, Illinois

v t e Municipalities and communities of St. Clair County, Illinois, United States
County seat: Belleville
Cities	Belleville \| Centreville \| Collinsville‡ \| East St. Louis \| Fairview Heights \| Lebanon \| Madison‡ \| Mascoutah \| O'Fallon	Map of Illinois highlighting St. Clair County
Villages	Alorton \| Cahokia \| Caseyville \| Dupo \| East Carondelet \| Fairmont City‡ \| Fayetteville \| Freeburg \| Hecker‡ \| Lenzburg \| Marissa \| Millstadt \| New Athens \| New Baden‡ \| Sauget \| Scott AFB \| Shiloh \| Smithton \| St. Libory \| Summerfield \| Swansea \| Washington Park
Townships	Canteen \| Caseyville \| Centreville \| Engelmann \| Fayetteville \| Freeburg \| Lebanon \| Lenzburg \| Marissa \| Mascoutah \| Millstadt \| New Athens \| O’Fallon \| Prairie du Long \| Shiloh Valley \| Smithton \| St. Clair \| Stites \| Stookey \| Sugarloaf
Unincorporated community	Douglas
Footnotes	‡This populated place also has portions in an adjacent county or counties
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