Whiteside County
County in Illinois
Whiteside County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 55,691. Its county seat is Morrison. The county is bounded on the west by the Mississippi River. Wikipedia
Cities: Morrison, Sterling, Rock Falls, and more
County seat: Morrison
Congressional district: 17th
Founded: 1836
Largest city: Sterling
Named for: Samuel Whiteside