Since 1946, the town has been part of the then newly founded state of Rhineland-Palatinate. In 1952, the outlying centre of Boppard-Buchenau was founded. In the course of administrative restructuring in Rhineland-Palatinate in the 1960s, the district of Sankt Goar was dissolved and Boppard was grouped into the new district of Rhein-Hunsrück-Kreis. Municipal boundaries, too, underwent reform. For Boppard, this meant that as of 28 July 1970, the town found itself, along with Bad Salzig, Buchholz, Herschwiesen, Hirzenach, Holzfeld, Oppenhausen, Rheinbay, Udenhausen and Weiler in a new "Verbandsgemeinde". This, however, did not last. Later that same year, the idea was floated to merge Boppard with these nine other municipalities to form a unified, greater Boppard. This was meant to simplify administration, and besides, it would bring the town a DM 12,000,000 bonus from the state. With the promise that this money would be spent mainly on the outlying centres, eight of the ten still self-administering municipalities – including Boppard itself – came round to seeing the merger as the right way to proceed. Bad Salzig, on the other hand, would only agree to amalgamation as long as the new, greater Boppard could be called Boppard-Bad Salzig. Oppenhausen, for its part, completely refused to even consider the idea. Nonetheless, since the municipalities that agreed to amalgamation were home to more than two thirds of the "Verbandsgemeinde"’s population, and since the "Verbandsgemeinde" council itself also supported the proposal, the Minister of the Interior was able to effect the change by issuing a regulation. This was implemented on 31 December 1975. The newly founded municipality was given the name of Boppard. This led the now "Ortsteil" of Bad Salzig to appeal to the State Constitutional Court – on the same day – and file suit to have the Interior Ministry’s regulation overturned. The ruling came on 8 May 1977; the Court rejected Bad Salzig’s bid.