Caijia is spoken by about 1,000 people in Hezhang and Weining Counties of western Guizhou province, China. Their autonym is men31 ni33. According to Chinese sources, this aberrant Tibeto-Burman language is likely related to the poorly attested Longjia (龙家) and Luren (卢人) languages of western Guizhou, and possibly also Bai of Yunnan. Caijia is not listed in Ethnologue.