Lumaco is a town and commune in Malleco Province in the Araucanía Region of Chile. Its name in Mapudungun means "water of luma". Lumaco is located to 120 km (75 mi) northeast of Temuco and 52 km (32 mi) from Angol. It shares a boundary to the north with the communes of Purén and Los Sauces, to the east with Traiguén and Galvarino, to the south with Cholchol and Carahue in Cautin Province, and the west with Tirúa and Contulmo in the Arauco Province of the Biobío Region.

The epicenter of the 1960 Valdivia earthquake was near Lumaco.

According to the 2002 census of the National Statistics Institute, Lumaco spans an area of 1,119 km² (432 sq mi) and has 11,405 inhabitants (6,074 men and 5,331 women). Of these, 4,132 (36.2%) lived in urban areas and 7,273 (63.8%) in rural areas. The population fell by 7% (853 persons) between the 1992 and 2002 censuses.

As a commune, Lumaco is a third-level administrative division of Chile administered by a municipal council, headed by an alcalde who is directly elected every four years. The 2008-2012 alcalde is Manuel Painiqueo Tragnolao (PS).

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