Prussia was partitioned among the four Allied occupation zones after 1945. In 1947 the Allied Control Council for Germany formally abolished the state of Prussia. This action not only confirmed an accomplished fact; it was also intended as a blow against the spirit of German militarism and aggression, long held to be connected with Prussia. Most of the former Prussian provinces became part of the new states of the Federal Republic of Germany and of the German Democratic Republic (now reunified). The USSR annexed the northern part of East Prussia; Poland acquired the rest of East Prussia.
Are you talking about the old German kingdom of Prussia? It was dissolved after the Second World War and its lands split up between current German Länder.