Illinois biggest county

Illinois Has 102 Counties–Can You Name The Smallest One?
Illinois Has 102 Counties–Can You Name The Smallest One?
Illinois Has 102 Counties–Can You Name The Smallest One?
Most of us would be unable to name each and every one of Illinois' 102 counties, and probably would have trouble naming more counties than they hear during a local weather event. By population, Cook County is Illinois' largest, so which county sits at the other end of the spectrum?