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) [XC428875]
by GABRIEL LEITE from Departamento de Salto - R\u00edo Arapey Chico- Pueblo Las Flores, Uruguay (call, flight call)
Diademed Tanager (Stephanophorus diadematus) [XC632377]
by JAYRSON ARAUJO DE OLIVEIRA from Ubajay, Departamento Col\u00f3n, Entre R\u00edos, Argentina (song)