In 1793, French Revolutionary troops took over the Lordship of Reipoltskirchen and thereby the village of Relsberg, too. The populace was made to pay contributions. In 1799, France dissolved all the old lordships and thereby the Lordship of Reipoltskirchen, too. Within the French First Republic, Relsberg now belonged to the "Mairie" (“Mayoralty”) of Hefersweiler, the Canton of Wolfstein, the Arrondissement of Kaiserslautern and the Department of Mont-Tonnerre (or Donnersberg in German). After the reconquest of the German lands on the Rhine’s left bank in 1814 by Prussian, Austrian and Russian troops, the Congress of Vienna drew new boundaries yet again. After a transitional time, Relsberg was grouped into the "bayerischer Rheinkreis", later known as "Rheinpfalz" (“Rhenish Palatinate”), an exclave of the Kingdom of Bavaria in 1816. Relsberg then found itself in the canton of the "Landcommissariat" of Kusel and the "Bürgermeisterei" (“Mayoralty”) of Hefersweiler. In the late 1920s and early 1930s, the Nazi Party (NSDAP) became very popular in Relsberg. In the 1928 Reichstag elections, 61% of the local votes went to Adolf Hitler’s party, but by the 1930 Reichstag elections, this had grown to 90%. By the time of the 1933 Reichstag elections, after Hitler had already seized power, local support for the Nazis had swollen to a full 100%. This level of support was matched in very few other places in the area. Hitler's success in these elections paved the way for his Enabling Act of 1933 ("Ermächtigungsgesetz"), thus starting the Third Reich in earnest. The village stayed with Bavaria until the end of the Second World War, when it became part of the Federal Republic of Germany within the then newly founded state of Rhineland-Palatinate. In the course of administrative restructuring in this state in 1968, Relsberg became an "Ortsgemeinde" within the "Verbandsgemeinde" of Wolfstein and the Kusel district in 1972.