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Rockford is the third largest city in the U.S. state of Illinois, the 171st most populous city in the United States, the largest city in Illinois outside the Chicago metropolitan area, and the city of the 148th most populous metropolitan area in the United States. It is the county seat of Winnebago County and is on both banks of the Rock River in far northern Illinois. A small portion of Rockford dips down into neighboring Ogle County. More from Wikipedia...