South-eastern Colombia (Guainía and Vaupés), southern Venezuela (Amazonas) and north-western Brazil (northern Amazonas east to Presidente Figueiredo); also southern Guyana.
 
Population
Estimated population is unknown (2010).
White-naped Seedeater (Sporophila) [XC169563]
by Guy Kirwan from Sistemas de Trilhas do PPBio, Parque Nacional do Viru\u00e1, Caracara\u00ed, Roraima, Brazil (song)
White-naped Seedeater (Sporophila) [XC81447]
by GABRIEL LEITE from Mitu, Vaupes, Colombia (song)
Subspecies
No subspecies.
Molecular work indicates that genus is very closely related to Sporophila and should perhaps be merged with it. Appears not to be close to Catamenia and some other genera with which it has been placed in the past.