Eisenberg is a municipality in the Donnersbergkreis, in Rhineland-Palatinate, Germany. Eisenberg is the seat of the Verbandsgemeind…Eisenberg is a municipality in the Donnersbergkreis, in Rhineland-Palatinate, Germany. Eisenberg is the seat of the Verbandsgemeinde Eisenberg. The name indicates ancient iron mining. Even more important is the extraction of clay and Klebsand.