L1 users: 2,030 (2009 census).
Lai Chau province: Muong Te district, east of Sila, south of Mang; Ban Nam Luong, 4 villages; Kan Ho commune, Bo Lech; Nam Khao commune; Muong Toong commune, Ban Bo village; Dien Bien province: Muong Nhé district, Nam Ke and Pa Thom communes, near the Lao border.
6a (Vigorous). Language of recognized ethnic group: Cong.
No final consonants.
Few domains. All ages. Positive attitudes.
Cong is an official ethnic community.