It is spoken by approximately 1,500 speakers in Mường Tè District, Lai Châu Province, Vietnam.
According to Jerold Edmondson (2002), Cốông is spoken in 5 villages of Mường Tè District, Lai Châu Province, Vietnam.
According to Phạm Huy (1998:10), Côống is spoken in the following villages, all of which are in Mường Tè District except for Huổi Sâư.
Phạm Huy (1998:12) lists the following two Côống ethnic subdivisions.
Golden Côống and Silver Côống differ linguistically, as illustrated by the following phrases from Phạm (1998:13) in Vietnamese orthography (quốc ngữ).