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) [XC772849]
by JAYRSON ARAUJO DE OLIVEIRA from Patroc\u00ednio, Minas Gerais State, Brazil (call, song)
Large-billed Antwren (Herpsilochmus longirostris) [XC297407]
by Robson Silva e Silva from Estancia Sehuencoma, Bolivia (call, song)
Subspecies
Thought to be most closely related to Pectoral Antwren (Herpsilochmus pectoralis) on basis of plumage and distribution, although vocalizations not closely similar.