27,500 (2000 INALI). Original Soyaltepec variety may only be 900, mostly monolingual. 1,930 monolinguals.
Oaxaca, northwest Tuxtepec district, Soyaltepec municipality, Santa María Jacatepec and San Miguel Soyaltepec towns, 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.