Janesville, city (1990 pop. 52,133), seat of Rock co., S central Wis., on the Rock River; inc. 1853. It is an industrial and commercial center in a grain, dairy farm, and tobacco area. Manufactures include agricultural and transportation equipment, machinery, metal and plastic products, and feeds. A state school for the blind is located in Janesville. Points of interest include the 26-room Tallman House, where Lincoln spent a weekend in 1859; the Stone House (1842), of Greek Revival style; and the Milton House (1844), which is connected to a log cabin by a tunnel used by runaway slaves as a stop on the Underground Railroad.