L1 users: 68,400 (1999 census). Ethnic population: 75,000 (2009 census).
North Nghe An province, highland areas, Cuoi Cham dialect in Tan Ky district, Tan Hop commune; also in Thanh Hoa province.
6a (Vigorous). Language of recognized ethnic group: Tho.
Cuoi Cham (Uy Lo), Mon.
Tho is an official ethnic community. Associated culturally with other principal local ethnonyms Keo, Mon, Cuoi, Ho, Dan, Lai-Ly Ha, and Tay Poong.