
With that in mind, here are the 10 best-selling American single-issue comic books, according to the most concrete numbers in the industry’s spotty history. We also owe a grudging debt to Diamond Comics distributors, for the company’s monopolistic takeover of the American comic book shipping market, and its regular reporting of comic book pre-order sales ever since. Our research owes a lot to Comichron’s detailed compilations of the categories of best-selling comics the site’s post about the difficulties of naming the “best-selling comics ever” is good and edifying reading. You wind up with a list more like “The 10 best-selling American single-issue comic books of all time that we have hard data on.” If you want to base everything on confirmed numbers, you’ve got to throw in quite a few caveats. And that’s without considering the apples to oranges comparison of America’s single issues method of distribution to, say, Japan’s doorstop-like weekly anthology magazines. There are decades of comics history where industry number-crunchers only counted how many issues of Superman and Captain America newsstands ordered, leaving historians with only hard sales numbers from 1997 onward.

When it comes to determining the exact rundown of the best-selling comics of all time, the data is murky. In 1991, X-Men #1 sold an estimated 8,186,500 copies, making it a likely contender for the best-selling single-issue comic book in history.
