Geneseo (je-nuh-SEE-o), city (1990 pop. 5,990), Henry co., NW Ill., near old Illinois and Mississippi Canal (now Hennepin Canal State Trail), 11 mi/18 km N of Cambridge; 41°27'N 90°09'W. Farm trade center in agr. (corn, oats, wheat; livestock) area. Mfg. (food prods.). Settled 1836, inc. 1855.