In the year 1936, Arlen became a part of Rielasingen, because Rielasingen had to cede over 129 hectares over to
Singen, and as exchange they got the village of Arlen. In the year 1975, the Municipality "Rielasingen-Worblingen formed by merging Rielasingen (with Arlen) and Worblingen. == Arlen ==