nov 15, 1940 - By November 15, 1940, the Ghetto was fully constructed held approx 400,000 Polish Jews.

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By November 15, 1940, the walls of the Warsaw Ghetto were fully constructed and approximately 400,000 Polish Jews found themselves within 1.3 square miles in the Muranów neighborhood. At its highest estimate, up to 489,000 lived in the ghetto at one time
between 1940 and 1943.

https://cupola.gettysburg.edu/cgi/viewcontent.cgi?article=2007&context=student_scholarship

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