Raisio is a town in Finland, located in the Southwest Finland region. It lies north of the regional capital, Turku. The population of Raisio is appro…Raisio is a town in Finland, located in the Southwest Finland region. It lies north of the regional capital, Turku. The population of Raisio is approximately 26,000, while the sub-region has a population of approximately 350,000. It is the 40th most populous municipality in Finland, and the third largest municipality in the Southwest Finland region after Turku ja Kaarina.