All county officers and officers chosen for any portion or district of a county and all municipal officers and officers chosen for any portion or ward of a municipality, shall be authorized to exercise the duties and functions of the office to which they are elected, after they have received certificates of their election, as provided by law, whether they have received their commissions or not; but such officers shall first give bond, if any, required by law or ordinance, and take the oath of office prescribed by the constitution.