South-eastern Brazil (Paraná and Sío Paulo east to southern Minas Gerais and Rio de Janeiro, south to Rio Grande do Sul), adjacent eastern Paraguay, Uruguay and north-eastern Argentina (eastern from extreme eastern Santa Fe, south to northern Buenos Aires).
 
Population
Estimated population is unknown (2010).
Diademed Tanager (Stephanophorus diadematus) [XC724913]
by JAYRSON ARAUJO DE OLIVEIRA from Urupema. Pousada Rio dos Touros, Santa Catarina, Brazil (call)
Diademed Tanager (Stephanophorus diadematus) [XC7886]
by Evair Legal from Campanero, near Minas, Lavalleja, Uruguay (song)