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) [XC863785]
by Fernando Igor de Godoy from Fazenda S\u00e3o Miguel, Itaj\u00e1, Goi\u00e1s, Brazil (call, song, bater de asas)
Large-billed Antwren (Herpsilochmus longirostris) [XC581032]
by GABRIEL LEITE from Pantanal Wildlife Center, MT, Brazil (?)
Subspecies
Thought to be most closely related to Pectoral Antwren (Herpsilochmus pectoralis) on basis of plumage and distribution, although vocalizations not closely similar.