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. Atacos's population has pre-Columbian origin and was founded by Yaqui Indians or pipiles in central Apaneca Mountain Range.
In Nahuatl, Ataco means "high place of springs.”
Concepción de Ataco's "sister city" is Elk Grove, California.