Chalcatongo Mixtec

Atatláhuca–San Miguel Mixtec
Native to	Mexico
Region	Oaxaca, Guerrero
Native speakers	28,000 (1995–2010)
Language family	Oto-Manguean Mixtecan Mixtec Atatláhuca–San Miguel Mixtec
Language codes
ISO 639-3	Variously: – Atatláhuca – Santa Lucía Monteverde – Itundujía – Yosondúa – San Miguel el Grande – San Juan Teita – Tijaltepec – Sinicahua – Tacahua (Yolotepec)
Glottolog	`west2824` partial match

Atatláhuca–San Miguel Mixtec is a diverse Mixtec language of Oaxaca.

Egland & Bartholomew found six dialects (with > ≈80% internal intelligibility) which had about 70% mutual intelligibility with each other:

Ethnologue notes that two additional varieties Egland & Bartholomew had not looked at, Sinicahua [xti] and Tijaltepec [xtl], are about as similar.