Which Mexican regions have the greatest concentration of Otomanguean languages?

The Otomanguean languages are primarily concentrated in a wide area of central and southern Mexico, situated between Uto-Aztecan populations to the north and east and Mayan peoples to the south.1

The distribution of these languages across specific Mexican states includes:

• Central Mexico: The Otomí language is spoken in Hidalgo, México, Veracruz, and Querétaro. Mazahua is also found in the states of Michoacán and México.2
• Southern Mexico: Mixtec dialects are spoken in Guerrero, Puebla, and Oaxaca. Zapotec dialects are primarily concentrated in the state of Oaxaca.2

While historically some Otomanguean languages were spoken as far south as Central America, the living languages of this phylum are now found within Mexico.2