It was county town until 1970 of the district Süderdithmarschen. After a district reform Süderdithmarschen and Norderdithmarschen merged to Dithmarschen
known as Steinburg – Süderdithmarschen. It contained parts of the abolished constituencies of Steinburg and Norder- und Süderdithmarschen. Until 1972, it was
Flag City Date Description Süderdithmarschen 1 January 1963 – 25 April 1970 A white flag with 7 red and white stripes and a knight. The knight in white