According to the United States Holocaust Memorial Museum, the Jewish population of Europe in 1933 was approximately 9.5 million. By 1939, the Jewish population of Europe had grown to over 9.7 million.

During World War II, an estimated six million Jews were killed in the Holocaust. This means that approximately two-thirds of the Jewish population of Europe at the time was killed. It's important to note, however, that not all Jews in Europe were killed during the Holocaust as some were able to flee or were hidden by non-Jewish individuals or organizations.
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