Tlacopan ruled the Tepanec towns of the western Basin, including Azcapotzalco and Coyoacán, and towns farther north to the Otomí center of Xilotepec.
Tlacopan held dominion over the Tepanec settlements in the western Basin, encompassing Azcapotzalco and Coyoacán, as well as towns situated farther north towards the Otomí city of Xilotepec.