Hanko () is a city in Uusimaa, Finland. As of January 2014, about 9,100 people lived there. More people come to live in Hanko during the summer. Hanko is the most southern municipality in Finland. The municipilaty is surrounded by sea on three sides. Many of the people in Hanko speak Swedish instead of Finnish. Nearby municipalities include Kemiönsaari and Kemiönsaari.