Moving County

St. Clair County

FIPS code

163

County seat

Belleville

Established

1790

Origin

original two counties

Etymology

Arthur St. Clair (1737–1818), major general in the American Revolutionary War and first Governor of the Northwest Territory

Population

270,056

Area

664 sq mi
(1,720 km2)

County Information

Alorton, Belleville (County Seat), Brooklyn, Cahokia, Caseyville, Centreville, Darmstadt, Dupo, East Carondelet, East St. Louis, Fairview Heights, Fayetteville, Floraville, Freeburg, Lebanon, Lenzburg, Marissa, Mascoutah, Millstadt, New Athens, O'Fallon, Paderborn, Sauget, Shiloh, Smithton, St. Libory, Summerfield, Swansea, Washington Park