Ciudad López Mateos is a city in State of Mexico, Mexico, and the seat of the municipality called Atizapán de Zaragoza. It takes its name from the nahuatl word Ātīzapan, which is formed by three words: "ā-tl", which means "water", "tīza-tl", which means "white clay" and "īpan, which means "over" or "place over" in a metaphorical form. Finished this, the name means "Place over clay waters".