Klanxbüll is first mentioned in 1231 with an entry in the land register of the Danish king Valdemar II, since the former duchy of Schleswig (with short exceptions) belonged until 1864 to the Danish crown.
The town of Klanxbüll is initially mentioned in 1231 with a record in the land registry of Danish monarch Valdemar II. Historically, the region that includes Klanxbüll was part of the Duchy of Schleswig, which remained under Danish control until 1864.