Bangladesh, Bhutan, Cambodia (B), China (mainland), India, Laos (B), Myanmar, Nepal, Sri Lanka, Thailand, Vietnam.
Most of Indian Subcontinent (south to Sri Lanka) east to Myanmar, southern and south-eastern China (including Hainan), Thailand (except S) and Indochina.
 
Population
Estimated population is unknown (2010).
Ashy Woodswallow (Artamus fuscus) [XC741945]
by Greg Irving from Kazi Nazrul Islam Airport (near Dakshin Khanda), Bardhaman, West Bengal, India (uncertain)
Ashy Woodswallow (Artamus fuscus) [XC803330]
by Bram Piot from Dehong Dai and Jingpo Autonomous Prefecture, Yunnan, China (call, song)