Genoa, city (1990 pop. 3,083), De Kalb co., N Ill., on South Branch of Kishwaukee R. (bridged here), 9 mi/14.5 km NNW of Sycamore; 42°06'N 88°41'W. RR junction. In rich agr. area (dairying; hogs, sheep; corn, soybeans); mfg. (tools, communication equip.). Inc. 1876.