Bolivia (locally in northern Beni, northern Santa Cruz) and south-central and north-eastern Brazil (central Mato Grosso east to Tocantins and Goiás, extending north-eastern locally to southern Ceará and southern Piauí, and south to western Paraná and western Sío Paulo).
 
Population
Estimated population is unknown (2010).
Large-billed Antwren (Herpsilochmus longirostris) [XC224144]
by Sebastian K. Herzog from Pantanal, Porto Jofre area, Mato Grosso, Brazil (call, song, soft calls)
Large-billed Antwren (Herpsilochmus longirostris) [XC304391]
by Breno Dias Vitorino from Tr\u00eas Lagoas, Mato Grosso do Sul, Brazil (song)
Subspecies
Thought to be most closely related to Pectoral Antwren (Herpsilochmus pectoralis) on basis of plumage and distribution, although vocalizations not closely similar.