Whiteside County, Illinois is governed by a 27-member governing board. The current chair, county board is Martin Koster. See all 10 named officeholders and how to reach each office.
Population: 54,121.
Selected officeholders: Chair, County Board: Martin Koster · State's Attorney: Colleen Buckwalter · Sheriff: John Booker · County Clerk: Karen Stralow · Clerk of the Circuit Court: Sue Scott · Recorder of Deeds: Kendra Kophamer Bush.