27,500 (2000 INALI). Original Soyaltepec variety may only be 900, mostly monolingual. 1,930 monolinguals.
Oaxaca state: Tuxtepec district, Soyaltepec municipality, San Miguel Soyaltepec, Santa María Jacatepec and Soyaltepec island.
None known. 5% intelligibility of Chiquihuitlán [maq].
All ages. Also use Spanish [spa].
Latin script [Latn].
Dam built in 1954, resulted in many other Mazatec varieties moving into the municipality. Soyaltepec Island has the least mixture.