According to the 1999 census of the National Statistics Institute, Lo Espejo spans an area of 7.2 km2 (3 sq mi) and has 112,800 inhabitants (55,478 men and 57,322 women), and the commune is an entirely urban area.

[6][failed verification] As a commune, Lo Espejo 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 2021-2024 alcaldesa is Javiera Reyes Jara (PC).

[9] The communal council has the following members:[10] Within the electoral divisions of Chile, Lo Espejo is represented in the Chamber of Deputies by Pedro Browne (RN) and Guillermo Teillier (PC) as part of the 28th electoral district (together with Pedro Aguirre Cerda and San Miguel).

The commune is represented in the Senate by Soledad Alvear (PDC) and Pablo Longueira (UDI) as part of the 8th senatorial constituency (Santiago-East).