I think the accurate number is unknown as, like Karkaroff said, only Voldemorts knew all the Death Eaters. And I don't think Rowling has announced the number either.
posted over a year ago
Yeah... I agree with you. I'm not sure about the exact number but, if you count the names of the books and whose that are refered as "unknown name"... you can know (aprox.) the number of Death Eaters