Concepción de Ataco is a municipality and city within the Ahuachapán Department, El Salvador. It has an area of 61.03 km ² and a population of 18,101 inhabitants (est. 2006).The municipality administration is divided into 11 cantons, which are: El Arco, El Limo, El Naranjito, El Tronconal, La Ceiba, La Joya de los Apante, La Planxa, San Jose, Shucutitán and Texusín Chirizo.