On Might 6, 1968, the executive district of Wiesbaden ceased to exist by regulation, and from then on the executive district of Darmstadt additionally included the cities and counties that had beforehand been subordinate to the dissolved administrative district. The regional council in Darmstadt was subsequently additionally chargeable for the impartial cities of Frankfurt am Principal, Hanau and Wiesbaden in addition to for the districts of Biedenkopf, Dillkreis (Dillenburg), Gelnhausen, Hanau, Limburg, Principal-Taunus-Kreis (Frankfurt-Höchst), Oberlahnkreis (Weilburg) , Obertaunuskreis (Unhealthy Homburg vor der Höhe), Rheingaukreis (Rüdesheim am Rhein), Schlüchtern, Untertaunuskreis (Unhealthy Schwalbach), Usingen and Wetzlar (six city districts and 24 rural districts).
Throughout the regional reform, which was basically carried out in Hesse between 1972 and 1977 (with one other change within the Central Hesse space in 1979, see Lahn, Gießen, Wetzlar), the districts have been merged into bigger administrative items and the impartial cities of Hanau and Gießen into the encircling ones counties built-in.
After the district reform was lastly accomplished in 1979, the executive district of Darmstadt nonetheless included the impartial cities of Darmstadt, Frankfurt am Principal, Offenbach and Wiesbaden in addition to the districts of Bergstrasse, Darmstadt-Dieburg, Gießen, Groß-Gerau, Hochtaunuskreis, Lahn-Dill-Kreis, Limburg-Weilburg, Odenwaldkreis, Offenbach, Principal-Kinzig-Kreis, Principal-Taunus-Kreis, Rheingau-Taunus-Kreis, Vogelsbergkreis and Wetteraukreis (4 city districts and 14 rural districts).
On January 1, 1981, the executive district of Giessen was established. This meant that there have been once more three administrative districts in Hesse. The districts of Gießen, Lahn-Dill-Kreis, Limburg-Weilburg and Vogelsbergkreis in addition to Marburg-Biedenkopf have been assigned to the Gießen RP. Since then, the executive district of Darmstadt has included the 4 city districts and ten rural districts talked about above.