Upon the German defeat in World War I, the area was ceded to the newly established Second Polish Republic according to the 1919 Treaty of Versailles, with Międzychód as the westernmost town in Poland, administratively located in the Poznań Voivodeship.

[4] The town was again annexed by Nazi Germany and incorporated into the Reichsgau Wartheland upon the 1939 Invasion of Poland, which started World War II.

[6] In August 1944, the Germans carried out mass arrests of local members of the Home Army, the leading Polish underground resistance organization.

[7] Międzychód returned to Poland after World War II in 1945, while the German minority was expelled in accordance with the Potsdam Agreement.

[citation needed] In recent years the town's economy increasingly has relied as a resort for tourism on the surrounding lakes of the Warta valley.