Southern Brazil (Mato Grosso do Sul and southern Espírito Santo to northern Rio Grande do Sul), south-eastern Paraguay (eastern Alto Paraná) and north-eastern Argentina (Misiones, northern Corrientes).
 
Population
Estimated population is unknown (2010) and decreasing.
Status NT
Habitat destruction and degradation through agricultural conversion and deforestation for mining and plantation production, urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building, are the main threats.
For more information see BirdLife International Species Factsheet.
Creamy-bellied Gnatcatcher (Polioptila lactea) [XC95517]
by Bernabe Lopez-Lanus from Prefectura de Garab\u00ed, Corrientes, Argentina (song)
Creamy-bellied Gnatcatcher (Polioptila lactea) [XC194848]
by Fernando Igor de Godoy from Ruta 101, Parque Nacional Iguaz\u00fa, Misiones, Argentina (song)
Subspecies
No subspecies.
Possibly forms a superspecies with Tropical Gnatcatcher (Polioptila plumbea), and some earlier suggestions are that they may be conspecific.