The Board of Commissioners shall have the authority to create a position-classification agency and to delegate to such agency the power to establish and maintain a position-classification and compensation plan for all county employees except those whose election or appointment is otherwise provided for by law and except those enumerated in Section 3-14022. Without limitation as to the generality hereof the authority of such agency shall also extend to the offices of the Clerk of the Circuit Court, Sheriff, County Treasurer, Recorder, Coroner, Jury Commissioners, Public Defender, County Clerk, State‘s Attorney, County Assessor, Board of Appeals and Superintendent of Schools.