St. Clair County, Illinois
St. Clair County profile, demographic data, and geographic information.
Cities & Towns in St. Clair County
Constituent municipalities and census communities located within St. Clair County.
| City / Town Name | Classification | Census GEOID | Land Area |
|---|---|---|---|
| Belleville city | City | 1704845 | 23.24 sq mi |
| Brooklyn village | Village | 1708667 | 0.81 sq mi |
| Cahokia Heights city | City | 1710373 | 15.91 sq mi |
| Caseyville village | Village | 1711644 | 7.31 sq mi |
| Collinsville city | City | 1715599 | 15.42 sq mi |
| Columbia city | City | 1715833 | 10.56 sq mi |
| Darmstadt CDP | CDP | 1718641 | 0.07 sq mi |
| Dupo village | Village | 1721254 | 6.18 sq mi |
| East Carondelet village | Village | 1721618 | 1.22 sq mi |
| East St. Louis city | City | 1722255 | 13.95 sq mi |
| Fairmont City village | Village | 1724933 | 6.20 sq mi |
| Fairview Heights city | City | 1725141 | 11.46 sq mi |
| Fayetteville village | Village | 1725713 | 0.30 sq mi |
| Floraville CDP | CDP | 1726467 | 0.08 sq mi |
| Freeburg village | Village | 1727806 | 6.82 sq mi |
| Hecker village | Village | 1733877 | 0.27 sq mi |
| Lebanon city | City | 1742496 | 2.70 sq mi |
| Lenzburg village | Village | 1742860 | 1.15 sq mi |
| Madison city | City | 1745993 | 14.15 sq mi |
| Marissa village | Village | 1746955 | 7.21 sq mi |
| Mascoutah city | City | 1747423 | 9.64 sq mi |
| Millstadt village | Village | 1749386 | 3.56 sq mi |
| New Athens village | Village | 1752116 | 2.11 sq mi |
| New Baden village | Village | 1752142 | 1.85 sq mi |
| O'Fallon city | City | 1755249 | 16.04 sq mi |
| Paderborn CDP | CDP | 1757160 | 0.15 sq mi |
| Rentchler CDP | CDP | 1763355 | 0.31 sq mi |
| Sauget village | Village | 1767756 | 4.54 sq mi |
| Scott AFB CDP | CDP | 1768328 | 4.34 sq mi |
| Shiloh village | Village | 1769524 | 13.57 sq mi |
| Smithton village | Village | 1770252 | 4.51 sq mi |
| St. Libory village | Village | 1766989 | 0.97 sq mi |
| Summerfield village | Village | 1773547 | 0.52 sq mi |
| Swansea village | Village | 1774119 | 6.55 sq mi |
| Washington Park village | Village | 1779085 | 2.54 sq mi |