San Ildefonso, Hidalgo Wikipedia
San Ildefonso (Nahuatl: Chantepec and Otomi Mangu) is a town of Tepeji del Río municipality, in central-eastern Mexico. Is a town near to Tula de Allende city.
As of 2010, the town had a total population of 4,423. 90% of the people speak otomi language.