Cuéllar is a municipality in the Province of Segovia, within the autonomous community of Castile and León, Spain. The municipality had a popula…Cuéllar is a municipality in the Province of Segovia, within the autonomous community of Castile and León, Spain. The municipality had a population of 9,730 inhabitants according to the municipal register of inhabitants as of 1 January 2010, divided into 4,929 men and 4,801 women.