Chillarón del Rey is a municipality in the province of Guadalajara, within the autonomous community of Castile-La Mancha, Spain. It is a small, rural settlement in the interior of the Iberian Peninsula.
The municipality is sparsely populated. According to the 2004 census conducted by Spain's National Statistics Institute (INE), Chillarón del Rey had a population of 121 inhabitants. This figure reflects the pattern of small village populations characteristic of parts of rural Guadalajara province.
As a municipality, Chillarón del Rey holds the administrative status granted to local entities in Spain, with its own local government. Beyond its administrative identity and its recorded population, few widely documented details about the village are available.