The King County Courthouse is the administrative building housing the judicial branch of King County, Washington's government. It is located in downtown Seattle, just north of Pioneer Square. The 1916 structure houses the King County Prosecuting Attorney, the King County Sheriff's Office (KCSO), the King County Council, the King County Law Library, King County Work and Education Release, and courtrooms for the King County Superior Court and the Seattle District Court. It is located just north of City Hall Park at 516 Third Avenue, between Dilling Way and James Street.