According to the 2002
census conducted by the
National Statistics Institute, Nancagua spanned an area of and had 15,634 inhabitants (7,959 men and 7,675 women). Of these, 9,264 (59.3%) lived in
urban areas and 6,370 (40.7%) in
rural areas. The population grew by 8.5% (1,220 persons) between the 1992 and 2002 censuses. ==Administration==