Laguna de Duero is a municipality located in the province of Valladolid, Castile and León, Spain. According to the 2016 census (INE), the municipality has a population of 22 ,696 inhabitants.It is the second largest city in Valladolid behind Valladolid City.Nowadays it is an industrial town situated 7 km away from the capital city of Valladolid.