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Rockford, city, seat (1836) of Winnebago county, northern Illinois, U.S. It lies on the Rock River, about 90 miles (145 km) northwest of Chicago. Rockford was founded by New Englanders in 1834 as separate settlements (commonly known as Kentville and Haightville, for the founders of each) on each side of the river and originally called Midway (halfway between Chicago and Galena); it was renamed in 1837 for the ford across the river. Waterpower supplied by...