Ciudad López Mateos is a city in the State of Mexico, Mexico, and the municipal seat of the municipality called Atizapán de Zaragoza. The city was previously named San Francisco Atizapán, but the official name was changed after president Adolfo López Mateos, who was born in that town. However, the city is still commonly known as Atizapán. There were 489,160 inhabitants according to the 2010 census. It is the seventh-largest city in the state.