The chosen freeholders shall be elected by the voters of each county at the general election therein and, except as otherwise provided as to those first elected, shall hold office for three years from the annual stated meeting of the board next succeeding their election and until their successors shall have been elected and qualified.

The boards of chosen freeholders elected under sections 40:20-20 to 40:20-35 of this title shall organize at the annual stated meeting of the board next succeeding the election of its members and at the annual stated meeting each year thereafter.