St. Clair County, IL

SAINT CLAIR COUNTY, situated on the southwesterly boundary of Illinois, with Mississippi river on the west, and traversed by the Kaskaskia. Area, 649 square miles. Face of the country, even; soil, generally fertile. Seat of justice, Bellville. Pop. in 1820, 5,253; in 1830, 7,078; in 1840, 13,631; in 1850, 20,181. (Fanning's, 1853)