Breeds central, southern and eastern China (southern Gansu and Sichuan east to Hubei and Fujian, south to Guizhou, northern Guangxi and eastern Guangdong), also central Laos and northern Vietnam (central Annam). Non-breeding also northern and eastern Thailand, southern Laos and northern Vietnam (western and eastern Tonkin, northern Annam).
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is unknown (2010).
Sulphur-breasted Warbler (Phylloscopus ricketti) [XC884894]
by Nick Athanas from Fengxian Wetlands, Shanghai, China (song)
Sulphur-breasted Warbler (Phylloscopus ricketti) [XC251957]
by Mike Nelson from Huangshan Shi, Anhui Sheng, China (song)
Subspecies
No subspecies.
Has sometimes been treated as conspecific with Yellow-vented Warbler (Phylloscopus cantator). Subspecies goodsoni of Blyth's Leaf-Warbler (Phylloscopus reguloides) was formerly placed with this species.