The terms are staggered so that only half the 11-member board is elected every two years, thereby providing continuity. Supervisors representing odd-numbered districts are elected every fourth year counted from 2000. Supervisors representing even-numbered districts were elected to transitional two-year terms in 2000, thereafter to be elected every fourth year beginning 2002. Terms of office begin on the January 8 following the regular election for each seat. Each supervisor is required to live in their district, and although elections are held on a non-partisan basis without party labels on the ballot, as of 2018 all 11 supervisors are known to be members of the Democratic Party. The most recent supervisorial elections were held on November 6, 2018.