 Of these, 7,898 (64%) lived in urban areas and 4,437 (36%) in rural areas.The population grew by 8.9% (1,003 persons) between the 1992 and 2002 censuses.As a commune, Olivar is a third-level administrative division of Chile administered by a municipal council, headed by an "alcalde" (mayor) who is directly elected every four years.