How many people were killed at Majdanek?

An estimated 170,000 to 360,000 persons of 22 nationalities (chiefly Jews, Russians, and Poles) died there.

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The most recent estimate - by the research staff at the Majdanek Museum - is about 79,000. (Those very high figures above were issued by the Soviet Union shortly after the war and are unsupported by solid evidence). Please see the link.