The Chichimecos self identify as úza and call their language eza'r.
The language is currently spoken only in San Luis de la Paz (Guanajuato), in the settlements of Berlín, Buenavista (El Cuernito), Cerro Blanco, Colonia Benito Juárez [Plan Benito Juárez], Ejido Santa Ana y Lobos (Fracción de Lourdes), El Desmonte, El Sauz Tres, El Tepetate, Exhacienda de Ortega (Ejido Ortega), Garibaldi (El Cerrito), La Ciénega, La Curva, La Huerta, La Laguna (La Lagunita), La Leona, La Mesa de Jesús, La Norita, Los Dolores (Las Quince Letras), Lourdes (Estación de Lourdes), Maguey Blanco, Manzanares, Mesa de Escalante, Mesa de la Estacada, Mesa del Pueblo, Misión de Chichimecas, Norita del Refugio, Parajes, Paso Colorado, Piedras de Lumbre, Pozo Hondo (Exhacienda de Pozo Hondo), Puerto de la Virginita, Puerto del Gato, Rancho Nuevo de las Trojes, San Antonio Chiquito, San Antonio Primero, San Ignacio, San Isidro de Pozos (San Isidrito), San José del Carmen, and San Pedro de los Pozos (Mineral de Pozos).
[2] In 1934, Jacques Soustelle counted 452 chichimecas, 63 of whom were children who attended the local school.
Prior to that point the language was spoken in five other locations:[3] Chichimeca Jonaz is a tonal language and distinguishes high and low level tones.
[4] Sounds /β, ɾ/ are heard as voiced stops [b, d] when after a nasal consonant.