Eckerö is a municipality of Åland, an autonomous territory under Finnish sovereignty. The municipality has a population of 959(30 June 2025) and covers an area of 752.67 square kilometres (290.61 sq mi) ofwhich 644.94 km (249.01 sq mi)is water. The population density is8.9 inhabitants per square kilometre (23/sq mi).
The municipality is unilingually Swedish and 86.5% of the population are Swedish speakers. It is the westernmost municipality of Åland and Finland.The company Eckerö Linjen operates a ferry connection between Berghamn in Storby, Eckerö and Grisslehamn on Väddö, Norrtälje in Sweden.