About This Place
Rock Falls is a city in Whiteside County, Illinois, United States. The population was 9,266 at the 2010 census, down from 9,580. The city is located on the Rock River.
Rock Falls is located at 41°46′29″N 89°41′29″W / 41.77472°N 89.69139°W / 41.77472; -89.69139 (41.774753, -89.691328).
The city is separated from its sister city, Sterling, to the North by the Rock River.