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) [XC21687]
by Mathias Ritschard from Khonoma Village, Nagaland, India (call)
Long-billed Wren-Babbler (Napothera malacoptila) [XC426880]
by Dibyendu Ash from Eagle Nest, Bompu camp area, Arrunachal Pradesh, India (call, song, song and call)