Eiken is a municipality in the district of Laufenburg in the canton of Aargau in Switzerland. The land was probably already occupied in the Roma…Eiken is a municipality in the district of Laufenburg in the canton of Aargau in Switzerland. The land was probably already occupied in the Roman era and individual objects from the Alamanni and Frankish Empire eras. Eiken is first mentioned in the first half of the 12th Century as Eitchon. The municipality of Sisseln was originally an expansion of Eichen, and it remained part of the municipality until 1806, when it became independent.