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) [XC88971]
by Bernabe Lopez-Lanus from Banhado do Ma\u00e7arico, Rio Grande, Rio Grande do Sul, Brazil (song)
Long-tailed Reed Finch (Donacospiza albifrons) [XC174646]
by Dan Lane from Anita Garibaldi, Santa Catarina, Brazil (song)
Subspecies
No subspecies.
Song and colour pattern suggest that this species may be closely related to Poospiza.