Castilfrío de la Sierra is a municipality located in the province of Soria, Castile and León, Spain. According to the 2004 census (INE), the municipality has a population of 27 inhabitants.
History During the Middle Ages, the locality belonged to the Community of Villa y Tierra de Soria as part of the Sexmo de Tera.This is recorded in the Census of the Population of the Crown of Castile from 1594.
The 1528 Census of Pecheros (taxpaying households), which excluded clergy, nobility, and hidalgos, documented 26 pecheros—families subject to taxation.Census of Pecheros. INE Volume II In the original document, the village is listed as Castelfrío de San Juan.
Following the collapse of the Old Regime, the locality became a constitutional municipality, then known as Castil Frío, in the region of Old Castile, Partido de Soria.Municipality Code INE -42-056 By the 1842 census, it had 85 households and 348 residents. By the mid-19th century, the village comprised approximately 100 houses. The settlement is described in the sixth volume of Pascual Madoz’s Diccionario geográfico-estadístico-histórico de España y sus posesiones de Ultramar as follows:
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