Gazetteer/Almanac
Headnote
MONROE COUNTY, situated on the southwest boundary of Illinois, with the Mississippi river on the west, and the Kaskaskia river on the east. Area, 360 square miles. Seat of justice, Waterloo. Pop. in 1830, 2,000; in 1840, 4,481; in 1850, 7,679. (Fanning's, 1853)