Olvera is a town in the province of Cádiz, Andalusia, Spain. According to the 2005 census, the city has a population of 8,585 inhabitants. At th…Olvera is a town in the province of Cádiz, Andalusia, Spain. According to the 2005 census, the city has a population of 8,585 inhabitants. At the tip of the "White towns route", the city of Olvera is in the province of Cadiz, in the northwest of the Serranía Gaditana area, near the borders of the provinces of Seville and Malaga, on 36º56' north and 5º16' west, at a height of 643 metres above sea level and has a land surface of 194 km².