Burundi, Congo [The Democratic Republic of the], Kenya, Malawi, Rwanda, Sudan, Tanzania [United Republic of], Uganda, Zambia.
Southern Sudan (Imatongs, Dongatona Mts, Didinga Hills), north-eastern and south-western Uganda (Mt Morongole, south-western highlands), highlands of eastern DRCongo, western Rwanda and western Burundi (Ruwenzoris south to Itombwe and Mt Kabobo), Kenya (Mt Kulal, Mt Elgon, western and central highlands), northern and eastern Tanzania (Crater Highlands east to Mt Kilimanjaro, and Ngurus and Ukagurus south to Njombe), and Nyika Plateau on Zambia-Malawi border.
 
Population
Estimated population is unknown (2010).
Mountain Yellow Warbler (Iduna similis) [XC799249]
by id from Aberdare National Park, Kenya (song)
Subspecies
No subspecies.
Genus generally considered as having affinities with Acrocephalus and Hippolais. This species usually regarded as forming a species pair with Yellow Flycatcher-Warbler (Iduna natalensis), and the two were formerly treated as flycatchers (Muscicapidae).