After the French victory over the electorate the Neuhaus area became part of the ephemeral Kingdom of Westphalia in early 1810, forming part of its "Lower Elbe département". When after the Great French War the bulk of Saxe-Lauenburg was separated from Hanover in 1815, the Neuhaus area, however, remained with Hanover, which had been elevated to Kingdom of Hanover the year before. After the Prussian annexation of Hanover Neuhaus became a part of the new Province of Hanover in 1866. At the introduction of Prussian style district administration in Hanover on 1 April 1885 Neuhaus area became part of the Bleckede district, merged into the District of Lüneburg on 1 October 1932.