If one takes Poland's pre-war borders, there were about 3.3 million Jews. About 10% of these survived - in other words just over 300,000. In addition, about 3 million Gentile Poles were also killed.
The exact number is unknown, and there are different definitions of Holocaust survivor. "When the war ended on 8th May 1945, it is estimated that there were around 200,000 Jewish survivors of the...