The spa town of Bad Sooden-Allendorf lies in the Werra valley near the Hoher Meißner, right on the boundary with Thuringia, almost at Germany's geographical centre, 33 km east of Kassel.

With this document, Charlemagne transferred the saltsprings, the saltpans, the saltworkers, the market, the tribute and the toll of the settlement of Westera to the Fulda Abbey.

Along with the downfall of the saltworks, however, came the discovery of the brine’s healing properties, and thus began the spa industry, with a bathhouse opening on 1 June 1881.

In late 2005, a new bathhouse with a big sauna area was finished, to lure privately paying guests to town.

The municipal election held on 26 March 2006 yielded the following results: The town's mayor is Frank Hix (Party of CDU).

They were the patricians, the City Council: Brandt, Breul, Casselmann, Cörper/Corper, Deichmann, Diede, Dietz, Dörr, Eschstruht, Frohn, Gaule, Gehrung, Gille, Grau, Grebe, Grunewald, Gundlach, Haas, von Haagen, Hupfeld, Hüter, Iring, von Jossa, Isenhuth, Kirchmeyer, Klinkerfuß, Königsee, Kraft, Kröschell, Lappe, Lutemann, Marold, Mattenberg, Meinhard, Jost Motz (um 1620), Müller, Neuenroth, Niedenstein, Geißler Praesendt (um 1585), Prediger, Quentel, Ruland, Saame, Schaffnicht, Heinrich Schaub (um 1440), Schmidt, Schnödde, Stephan, Storm, Thaurer, Tholde, Thorey, Valentin, Vielmeder, Vietor, Wagner, Weber, Wehr, Wissenbach, Wolff[3] The arms were approved by the State Archive in 1931.

At the focus stands Frau Holle, who is said to have lived on the nearby Hoher Meißner and to have daily shaken the featherbeds out in the historic Söder Tor (“Sooden Gate”) Spanish fricco is a traditional stew dish of Bad Sooden-Allendorf.