Beginning in 1794, Blankenrath lay under French rule. The neighbouring village of Reidenhausen, which hitherto had formed together with Blankenrath a single municipality, was separated. In 1814 Blankenrath was assigned to the Kingdom of Prussia at the Congress of Vienna, and the "Amt" of Blankenrath was founded. Since 1946, Blankenrath has been part of the then newly founded state of Rhineland-Palatinate. Under the "Verwaltungsvereinfachungsgesetz" (“Administration Simplification Law”) of 18 July 1970, with effect from 7 November 1970, the municipality was grouped into the "Verbandsgemeinde" of Zell, losing its "Amt" status in the process once the municipality of Mastershausen had been transferred to the Rhein-Hunsrück-Kreis, precluding any grounds for Blankenrath to have its own "Verbandsgemeinde".