[4] On 23 May 1624 Francis' daughter Sophia Hedwig (Lauenburg upon Elbe, *24 May 1601 - 21 February 1660*, Glücksburg) married Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg in Neuhaus Castle.

[5] On his ascension in 1619 Duke Augustus, son of Francis II, moved Saxe-Lauenburg's capital from Neuhaus upon Elbe towards Ratzeburg, where it remained since.

The initial British occupation zone in Germany had no bridge between the bulk of the Hanover province south of the Elbe, and the Amt Neuhaus area north of the Elbe, so the British ceded the Neuhaus area to the state of Mecklenburg within the Soviet zone of occupation in Germany.

Families considered to be living too close to the border were evacuated and their houses demolished, including part of the village Vockfey [de].

The eight newly-elected municipal councils each decided unanimously for a reintegration into the District of Lüneburg, which since 1946 had belonged to the West German state of Lower Saxony.

In an interstate treaty, both states agreed to separate Amt Neuhaus from Mecklenburg-Vorpommern on 30 June 1993, when it was annexed to Lower Saxony.

The treaty also included the historically Mecklenburgian village of Niendorf, which had belonged to Sumte since 1 January 1974, and the north-Elbian suburbs of the otherwise south-Elbian city of Bleckede, which were also reunited after their separation by the occupying British in 1945.

The municipality comprises the following seven component localities: Dellien, Haar, Kaarßen, Neuhaus upon Elbe, Stapel, Sumte and Tripkau.

They include the following settlements and places: Banke, Bitter, Bohnenburg, Brandstade, Darchau, Dellien, Gosewerder, Gülstorf, Gülze, Gutitz, Haar, Herrenhof, Kaarßen, Klein Banratz, Konau, Krusendorf, Laake, Laave, Neu Garge, Neuhaus, Niendorf, Pinnau, Pommau, Preten, Privelack, Raffatz, Rassau, Rosien, Stapel, Stiepelse, Stixe, Strachau, Sückau, Sumte, Tripkau, Viehle, Vockfey [de], Wehningen [de], Wilkenstorf and Zeetze.