According to the 2002 census of the National Statistics Institute, Curanilahue spans an area of 994.3 km2 (384 sq mi) and has 31,943 inhabitants (16,115 men and 15,828 women). Of these, 30,126 (94.3%) lived in urban areas and 1,817 (5.7%) in rural areas. Between the 1992 and 2002 censuses, the population fell by 5% (1,688 persons).[3]
Within the electoral divisions of Chile, Curanilahue is represented in the Chamber of Deputies by Manuel Monsalve (PS) and Iván Norambuena (UDI) as part of the 46th electoral district, together with Lota, Lebu, Arauco, Los Álamos, Cañete, Contulmo and Tirúa. The commune is represented in the Senate by Victor Pérez Varela (UDI) and Mariano Ruiz-Esquide Jara (PDC) as part of the 13th senatorial constituency (Biobío-Coast).
