400,000 (1977 G. Doerfer).
Northeast, Khorasan-e Shemali Province, northwest of Mashhad; west dialect in Bojnurd area, north in Quchan area (probably largest), south in Soltanabad area near Sabzevar.
West Quchani (Northwest Quchani), North Quchani (Northeast Quchani), South Quchani. Midway linguistically between Azerbaijani and Turkmen [tuk], but not a dialect of either. The Oghuz-Uzbek dialect of Uzbek, Northern [uzn] in Uzbekistan is reportedly a dialect. Different from Khorasani, a local Persian dialect in Khorasan.
Also use Iranian Persian [pes].
Arabic script, Nastaliq variant [Aran].