Aranda de Duero is a town and municipality, capital of the Ribera del Duero comarca, in south of the province of Burgos, in Castile and León, Spain. It has a population of roughly 33,000 people. The post code for the town is 09400. The closest airport is in Burgos. The municipality of Aranda de Duero is made up of three towns: Aranda de Duero (seat or capital), La Aguilera and Sinovas. Aranda de Duero is the capital of the Ribera del Duero wine region.