|Town and Commune|
|• Alcalde||Gustavo Valdenegro Rubillo|
|• Total||1,516.6 km2 (585.6 sq mi)|
|Elevation||495 m (1,624 ft)|
|Population (2012 Census)|
|• Density||6.5/km2 (17/sq mi)|
|Time zone||CLT  (UTC-4)|
|• Summer (DST)||CLST  (UTC-3)|
|Area code(s)||56 + 33|
|Website||Municipality of Petorca|
According to the 2002 census of the National Statistics Institute, Petorca has 9,440 inhabitants (4,806 men and 4,634 women). Of these, 4,535 (48%) lived in urban areas and 4,905 (52%) in rural areas. The population grew by 1.8% (167 persons) between the 1992 and 2002 censuses.
As a commune, Petorca 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 2012-2016 alcalde is Gustavo Valdenegro Rubillo. The council has the following members:
- Ena Jorquera Jorquera
- Ignacio Villalobos Henríquez
- Orlando Montes Astudillo
- Claudio Gonzalo Arenas
- Juan Prado Díaz
- Rodrigo Cuevas Vivanco
Within the electoral divisions of Chile, Petorca is represented in the Chamber of Deputies by Mr. Eduardo Cerda (PDC) and Mrs. Andrea Molina (UDI) as part of the 10th electoral district, (together with La Ligua Cabildo, Papudo, Zapallar, Puchuncaví, Quintero, Nogales, Calera, La Cruz, Quillota and Hijuelas). The commune is represented in the Senate by Ignacio Walker Prieto (PDC) and Lily Pérez San Martín (RN) as part of the 5th senatorial constituency (Valparaíso-Cordillera).
- "Municipality of Petorca" (in Spanish). Retrieved 28 July 2010.
- "National Statistics Institute" (in Spanish). Retrieved 10 November 2010.
- "Chile Time". WorldTimeZones.org. Retrieved 2010-07-28.
- "Chile Summer Time". WorldTimeZones.org. Retrieved 2010-07-28.
- (in Spanish) Municipality of Petorca