400,000 (1977 G. Doerfer).
Northeast, north Khorasan Province, northwest of Mashhad. West dialect in Bojnurd area; north in Quchan area (probably largest), south in Soltanabad area near Sabzevar.
North Quchani (Northeast Quchani), South Quchani, West Quchani (Northwest 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 Farsi [pes].