Rock Falls, Illinois

Rock Falls
View of downtown buildings in Rock Falls, IL
Location of Rock Falls in Whiteside County, Illinois.
Location of Illinois in the United States
Coordinates: 41°46′29″N 89°41′29″W / 41.77472°N 89.69139°W / 41.77472; -89.69139
CountryUnited States
StateIllinois
CountyWhiteside
Founded byA.P. Smith
Government
  TypeMayor-council
  MayorRodney G. Kleckler
  City AttorneyJames L. Reese
Area
  Total
4.12 sq mi (10.68 km2)
  Land3.98 sq mi (10.32 km2)
  Water0.14 sq mi (0.36 km2)
Population
 (2020)
  Total
8,789
  Density2,206.63/sq mi (852.02/km2)
Time zoneUTC−6 (CST)
  Summer (DST)UTC−5 (CDT)
ZIP Code(s)
61071
Area code815
FIPS code17-64928
Wikimedia CommonsRock Falls, Illinois
Websiterockfalls61071.net

Rock Falls is a city in Whiteside County, Illinois, United States. The recorded population was 8,606 at the 2020 census, down 7.12% from 9,266 in 2010. The city is located on the Rock River, directly opposite its twin city of Sterling.