North-eastern Bolivia (Beni and Santa Cruz), most of Paraguay, and southern Brazil (southern from southern Mato Grosso and Santa Catarina, occasionally Paraná and possibly also Sío Paulo) south to north-western and eastern Argentina (northern Salta, Córdoba, and eastern Chaco south to Buenos Aires) and Uruguay.
 
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).
Scarlet-headed Blackbird (Amblyramphus holosericeus) [XC195218]
by Pedro Rinaldi from Reserva Provincial Estricta Otamendi, Campana, Buenos Aires, Argentina (song)
Scarlet-headed Blackbird (Amblyramphus holosericeus) [XC879304]
by Allen T. Chartier from Fazenda Rio Negro, Rio Negro, Aquidauana, Mato Grosso do Sul, Brazil (song)
Subspecies
No subspecies.
Analysis of mitochondrial DNA suggests relationship with Curaeus, but the two genera differ morphologically and behaviourally.