China (mainland) (B) (NB), India (B) (NB), Myanmar (B) (NB), Nepal.
Sikkim east to north-eastern India (to Arunachal Pradesh; also, disjunctly to south, from Meghalaya east to Nagaland and northern Manipur), northern Myanmar and adjacent southern China (north-western Yunnan).
 
Population
Estimated population is unknown (2011).
Long-billed Wren-Babbler (Napothera malacoptila) [XC21691]
by Arnold Meijer from Gumbadara, West Bengal, India (song)
Long-billed Wren-Babbler (Napothera malacoptila) [XC846034]
by Sandip das from Kalimpong (near Kolbong Forest), Jalpaiguri Division, West Bengal, India (song)