Kucong, or Black Lahu, is spoken in the following villages of Ca Lăng Commune, Mường Tè District, Lai Châu Province, Vietnam.
The Kucong and related Lahu groups had originally come from the Jinping County area of southern Yunnan, China.
[2] Sun Hongkai (1992) reports 30,000 Kucong speakers in Yunnan, China.
Li & Zhang (2003) cover the Kucong dialect of Kudumu Village (库独木村), Pingzhang Township (平掌乡), Xinping County (新平县).
In Yuanjiang County, Kucong (960 people total) is spoken in the following villages.