20,000 (2011 SIL).
Central Bhutan, Bumthang, Mangdi District around Tongsa in Mangdikha; northeast border of Kurto in Tsamangkha on the east; Yangtse District in Salabekha; Tawang; southeast Tibet.
Chogor, Chunmat, Tang, Ura. Some northern varieties of Khengkha [xkf] and some southern varieties of Bumthangkha are reported by one source to likely be mutually intelligible. Tawang Monpa [twm] in India (Tawan Monba in China) is the same as, or closely related to, Bumthangkha. Lexical similarity: 92% with Khengkha [xkf], 47%–52% with Dzongkha [dzo], 62%–65% with Adap [adp], 40%–50% with Tshangla [tsj], 75%–77% with Nyenkha [neh], 70%–73% with Kurtokha [xkz].