1,500 (2006 C. Shimmin), decreasing. No monolinguals. Ethnic population: 3,000 (Thongkum 1984).
Bueng Kan, Chaiyaphum, Kalasin, Nakhon Ratchasima, Phetchabun, Phitsanulok, and Sakon Nakhon provinces; Possibly in Khorat province.
Chaiyaphum users say they understand Petchabun only with difficulty, if at all. At least 91% lexical similarity among all dialects (Diffloth 1984).
Thai script [Thai].
Buddhist, Christian, traditional religion.