Sterling is a city in Whiteside County, Illinois, United States, along the Rock River. The population was 14,782 at the 2020 census, down fro…Sterling is a city in Whiteside County, Illinois, United States, along the Rock River. The population was 14,782 at the 2020 census, down from 15,370 in 2010. Formerly nicknamed "Hardware Capital of the World", the city has long been associated with manufacturing and the steel industry.
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