The seventh and final book in the series has been selling at a record-breaking pace at Amazon since pre-ordering began on 1 February.
Harry Potter and the Deathly Hallows surpassed Amazon's previous pre-order record held by Harry Potter and the Half-Blood Prince.
The web retailer has taken nearly 1.6 million pre-orders for Harry Potter and the Deathly Hallows worldwide, eclipsing the previous record of 1.5 million.
First-day pre-orders for the latest book in the US were 547 percent higher than first-day pre-orders for Harry Potter and the Half-Blood Prince.
Amazon said that sales for the seventh book have continued to outpace its predecessors at Amazon.com and each of its international sites.
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