Rock County It

Rock County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 163,687. Its county seat is Janesville. Rock County comprises the Janesville-Beloit, WI Metropolitan Statistical Area and is included in the Madison-Janesville-Beloit, WI Combined Statistical Area.
  • Country: United States
  • State: Wisconsin
  • Founded: 1839
  • Named for: Rock River
  • Seat: Janesville
  • Largest city: Janesville
  • Congressional districts: 1st, 2nd
Data from: en.wikipedia.org