King Frederick the Great of Prussia created Kreis Marienwerder as one of ten districts in an administrative reorganization of East Prussia (the former Duchy of Prussia) in 1752. After the king annexed most of Polish Royal Prussia in the 1772 First Partition of Poland, Marienwerder became a seat of government of the newly created Province of West Prussia in 1773.
After the Napoleonic Wars, Kreis Marienwerder was included within Regierungsbezirk Marienwerder in West Prussia on 1 April 1816. This administrative region consisted of territory east and west of the Vistula River.
In 1818, the new Kreis Rosenberg (Westpreußen) and the town of Rosenberg (Susz) were detached from Kreis Marienwerder. The older district was compensated with a few communities to the west of the Vistula.
As a result of World War I, the Treaty of Versailles allocated most of West Prussia to the Second Polish Republic (as the Polish Corridor) or the independent Free City of Danzig. On 10 January 1920, all of Kreis Marienwerder's territory west of the Vistula became part of Poland. The territory east of the river was first administered by the governor in Königsberg (Kaliningrad).
In a plebiscite on 11 July 1920, the inhabitants of the district voted to remain in the Free State of Prussia within Weimar Germany. Außendeich, Johannisdorf, Kleinfelde, Kramershof, and Neu Liebenau, communities east of the Vistula, became part of Poland on 12 August, however. On 1 July 1922, Kreis Marienwerder was formally incorporated into the Prussian Province of East Prussia. Regierungsbezirk Marienwerder was renamed Regierungsbezirk Westpreußen ("West Prussia"), while the regional president's seat remained in the town of Marienwerder.
In 1933, 65% of the district's population outside of the city of Marienwerder engaged in agriculture. On 1 January 1939, Kreis Marienwerder was renamed Landkreis Marienwerder, in accordance with a state-wide ruling.
World War II began on September 1 with the Invasion of Poland. On 26 October, the district became part of the newly created Reichsgau Westpreußen, the later Reichsgau Danzig-West Prussia. Regierungsbezirk Westpreußen was renamed to its original designation, Regierungsbezirk Marienwerder.
The previously Polish communities of Burztych (Außendeich), Janowo (Johannisdorf), Kramrowo (Kramersdorf), Male Polko (Kleinfelde), and Nowe Lignowy (Neuliebenau) were included within Landkreis Dirschau after their conquest at the beginning of the war. Retroactive to 26 October 1939, the communities were included within Landkreis Marienwerder on 2 December 1940.
In spring 1945, Landkreis Marienwerder was overrun by the Soviet Red Army. As a result of the post-war Potsdam Conference, the district was placed under Polish administration and German inhabitants were subsequently expelled westward. The district was dissolved and its territory made part of Olsztyn Voivodeship in Poland.
- This article incorporates information from the revision as of October 26, 2007 of the equivalent article on the German Wikipedia.