Central and southern Brazil, eastern Paraguay (Oriente) and northern Argentina (Misiones); may also breed in Serranía de Huanchaca, north-eastern Bolivia, where recently recorded.
 
Population
Estimated population is unknown (2010).
Great Dusky Swift (Cypseloides senex) [XC500223]
by id from Parque Nacional da Serra da Canastra, S\u00e3o Roque de Minas, Minas Gerais, Brazil (call, song)
Great Dusky Swift (Cypseloides senex) [XC15429]
by Dante Buzzetti from Aguar\u00e1 \u00d1u, Canindey\u00fa, Paraguay (wing sounds)