Yebes is a municipality located in the province of Guadalajara, Castilla–La Mancha, Spain. According to the 2004 census, the municipality had …Yebes is a municipality located in the province of Guadalajara, Castilla–La Mancha, Spain. According to the 2004 census, the municipality had a population of 235 inhabitants. The Yebes Observatory with its RT40m radio telescope is located in Yebes.