Still, 58 percent of respondents believe that "something like the Holocaust could happen again".
The study, released on Thursday by The Conference Jewish Material Claims Against Germany, studied the awareness of American adults and millennial about the events of the Holocaust.
The survey found a low awareness of nations other than Germany where the Holocaust occurred: Just 5 to 6 percent of USA adults knew that Jews were killed in Estonia, Latvia and Lithuania, where 90 percent of the local Jewish populations were murdered.
"The issue is not that people deny the Holocaust; the issue is just that it's receding from memory", said Greg Schneider, the executive vice president of the Claims Conference, which negotiates restitution for Holocaust victims and their heirs.
Over a fifth of millennials in the United States have not heard of or are unsure if they have heard of the Holocaust, a study found. The actual number is estimated to be six million.
The survey also found that most believe there is still strong anti-semitic sentiment in the United States today, more than 70 years after the Holocaust.
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The Auschwitz-Birkenau complex, which lies in southern Poland, was the biggest death camp set up by Nazi Germans during World War II to eliminate European Jews. And, while 41% of respondents overall did not know what Auschwitz was, that figure was 66% among Millennials.
Around two-thirds (68 percent) of Americans believe there is anti-Semitism in the US today, and a majority (51 percent) think there is either a great deal of (17 percent) or many (34 percent) neo-Nazis in the country today.
Israeli Prime Minister Benjamin Netanyahu lays a wreath during a ceremony marking the annual Israeli Holocaust Remembrance Day at the Yad Vashem World Holocaust Remembrance Center in Jerusalem.
The survey of 1,350 Americans over 18 took place from February 23-27 and was conducted by Schoen Consulting with a margin of error of 3%. "There remain troubling gaps in Holocaust awareness while survivors are still with us; imagine when there are no longer survivors here to tell their stories".
The study found that the vast majority of respondents support Holocaust education. The margin of error is plus or minus 3 percentage points.