In the 1930 Reichstag elections, 7.7% of the local votes went to Adolf Hitler’s party.
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The village of Dennweiler belonged from the time of its founding onwards among lands held by the Bishopric of Verdun around the market town of Baumholder, whereas Frohnbach belonged to the Remigiusland held by the Abbey of Saint-Remi in Reims.
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Dennweiler-Frohnbach borders in the north on the town of Baumholder, in the east on the municipality of Oberalben and in the southwest on the municipality of Körborn.
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From the beginning of Bavarian times, about 1816, the now united double village of Dennweiler-Frohnbach belonged to the parish of Flurskappeln (Ulmet).
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By the time of the 1933 Reichstag elections, after Hitler had already seized power, local support for the Nazis had swollen to 82.4%.
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A village named Ruppertsweiler – not to be confused with Ruppertsweiler just east of Pirmasens, which has not vanished – first mentioned in 1270 as Ruprehtiswilre in a document issued by Count Heinrich of Veldenz and Geroldseck (the same as the one mentioned just above), lay northwest of Dennweiler on the road that went from Lichtenberg towards Baumholder.