Austria, China (mainland), Denmark, Hong Kong (China), Laos, Mongolia, North Korea, Russia (Asian), Russia (Central Asian), South Korea, Thailand, Vietnam.
Vagrant to Belgium, Bulgaria, Czech Republic, Estonia, Faroe Islands, Finland, France, Germany, Hungary, Ireland, Israel, Italy, Japan, Kazakhstan, Latvia, Luxembourg, Malta, Morocco, Netherlands, Norway, Poland, Portugal, Russia (European) (NB), Spain, Sweden, Taiwan (China), Tunisia, Ukraine, United Kingdom.
Breeds in south-central and south-eastern Siberia, from Altai Mts east to northern Sea of Okhotsk, south to northern Mongolia, north-eastern China (northern Heilongjiang, eastern Jilin) and Sakhalin I, possibly also northern Korea. Non-breeding south-eastern China, northern Thailand and northern Indochina.
 
Population
Estimated population is unknown (2011).
Pallas's Leaf Warbler (Phylloscopus proregulus) [XC892240]
by Bo Shunqi from \u68a6\u6e05\u56ed\uff0cJingan\uff0cShanghai, Shang Hai Shi, China (song)
Pallas's Leaf Warbler (Phylloscopus proregulus) [XC893014]
by Bo Shunqi\u8584\u987a\u5947 from Haiwan Forest Park, Fengxian, Shanghai, China (call)
Subspecies
No subspecies.
Phylloscopus proregulus (Sibley and Monroe 1990, 1993) has been split into Lemon-rumped Warbler (Phylloscopus proregulus) and Gansu Leaf-Warbler (Phylloscopus kansuensis) following Alström et al. (1997).
Formerly treated as conspecific with Lemon-rumped Leaf-Warbler (Phylloscopus chloronotus), and implicitly including also Gansu Leaf-Warbler (Phylloscopus kansuensis) and Chinese Leaf-Warbler (Phylloscopus yunnanensis). Recent studies, however, indicate that all are vocally distinct, and that they further differ genetically.
The Reader's Digest Book of British Birds 1980, 3rd Edition, Drive Publications Ltd ISBN 0 340 25308 8
Birds in Colour Campbell, B., 1960, Penguin Books Ltd
The Pocket Guide to Nest and Eggs Fitter, R.S.R., 1954, Collins
RSPB Handbook of British Birds Holden, P., Cleeves, T., 2002, A & C Black ISBN 0 7136 5713 8
Birds of Britain and Europe Sterry, P., et al., 2001, AA Publishing ISBN 0 7495 3068 5
The Popular Handbook of British Birds Hollom, P.A.D., 1973, H.F. & G. Witherby Ltd ISBN 0 85493 002 7