The city lies on the western shore of Lake Llanquihue, where the Maullín River starts.

[3] According to the 2002 census of the National Statistics Institute, Llanquihue spans an area of 420.8 km2 (162 sq mi) and has 16,337 inhabitants (8,141 men and 8,196 women).

[2] As a commune, Llanquihue 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, Llanquihue is represented in the Chamber of Deputies by Fidel Espinoza (PS) and Carlos Recondo (UDI) as part of the 56th electoral district, together with Puyehue, Río Negro, Purranque, Puerto Octay, Fresia, Frutillar, Puerto Varas and Los Muermos.

The commune is represented in the Senate by Camilo Escalona Medina (PS) and Carlos Kuschel Silva (RN) as part of the 17th senatorial constituency (Los Lagos Region).