Bolivia (Beni); south-eastern Paraguay and south-eastern Brazil (southern from southern Paraná, southern Sío Paulo, southern Minas Gerais and western Rio de Janeiro) south to north-eastern Argentina (Misiones, Corrientes, eastern Formosa and eastern Chaco south to eastern Córdoba and north-eastern Buenos Aires) and Uruguay.
 
Population
Estimated population is unknown (2010).
Long-tailed Reed Finch (Donacospiza albifrons) [XC212789]
by JAYRSON ARAUJO DE OLIVEIRA from Laguna, Santa Catarina, Brazil (song)
Long-tailed Reed Finch (Donacospiza albifrons) [XC108040]
by Vitor de Q. Piacentini from Estancia La Clarita, Ruta 40 entre 41 y 42, Galarza, Corrientes, Argentina (song)
Subspecies
No subspecies.
Song and colour pattern suggest that this species may be closely related to Poospiza.