Huichapan (Otomi: Nxamädo) is a town and one of the 84 municipalities of Hidalgo, in central-eastern Mexico. The municipality covers an area of 668.1 km2. Its name derives from the Classical Nahuatl Huēyichiyapan. In 2020, the municipality reported a total population of 47,425, up from 39,734 in 2005. In 2017 there were 425 inhabitants who spoke an indigenous language, primarily Otomí del Valle del Mezquital