Upper Lahn circle
the upper Lahn circle became after in June 1866 the occupation of the duchy Nassau by the Kingdom of Prussia by Prussian regulation of 22. February 1867 in an educated manner. It consisted of the formerly nassauischen offices Runkel, Hadamar and because castle. The seat of the district administration lay in because castle.
By a freiwilligen contract of change of area of the 1. July 1974 united the upper Lahn circle after 107jährigem existence with the district Limburg (formed 1886) to the district Limburg because castle. The two circles forestalled thereby an obligation union.