County of Mark
With the start of the year 1969, the Kreis Altena and the town Lüdenscheid were merged to form the new Kreis Lüdenscheid. Lüdenscheid became the new administrative center of the district. Only six years later the Kreis Lüdenscheid was reformed and enlarged. In reminiscence of the County of Mark it was renamed as Märkischer Kreis.