Erustes is a municipality in Spain, located in the province of Toledo within the autonomous community of Castile-La Mancha. It is a small, rural settlement in the central part of the country, situated in the comarca of Torrijos.
According to the 2006 census conducted by the Instituto Nacional de Estadística (INE), Erustes had a population of 209 inhabitants. This figure reflects the municipality's character as a sparsely populated village typical of the region.
Like many municipalities in the province of Toledo, Erustes is defined administratively as a municipality (municipio), the basic local government unit in Spain. The town lies within the broader historical and cultural landscape of Castile-La Mancha, a region known for its dry plains and agricultural traditions.