The commune includes Laguna del Laja and Laguna del Laja National Park, which contains Antuco Volcano and Sierra Velluda.

According to the 2002 census of the National Statistics Institute, Antuco spans an area of 1,884.1 km2 (727 sq mi) and has 3,908 inhabitants (1,981 men and 1,927 women).

[2] As a commune, Antuco is a third-level administrative division of Chile administered by a municipal council, headed by an alcalde who is directly elected every four years.

[1] Within the electoral divisions of Chile, Antuco is represented in the Chamber of Deputies by Juan Lobos (UDI) and José Pérez (PRSD) as part of the 47th electoral district, together with Los Ángeles, Tucapel, Quilleco, Santa Bárbara, Quilaco, Mulchén, Negrete, Nacimiento, San Rosendo, Laja and Alto Bío Bío.

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).