Rockford is a mid-sized city located on both banks of the Rock River in far northern Illinois. Often referred to as "The Forest City", Rockford is the county seat of Winnebago County, Illinois, USA. As reported in the 2000 U.S. census, the city was home to 150,115 people, while in the 2008 estimate, it was said to have a population of 157,272....................More Wikipedia info