Well, almost. Neil Gaiman writes that a “young lady named Anneli in Sweden” wrote him a fan letter:

The address she wrote on the front of the envelope was “The author Neil Gaiman. Lives in a big house of uncertain location in Minnesota USA”. On the 20th of November the United States Postal Service delivered that letter to me, care of DreamHaven Books, 912 W Lake St, Minneapolis MN 55408.

The bit in italics is from one of Gaiman’s books. Dreamhaven is a local science fiction/fantasy/comic book store that deals quite a bit with Mr. Gaiman, including creating a rather ugly online store dedicated to his books ‘n’ such. For someone at the post office to have made this connection is quite remarkable.

Either that, or Neil Gaiman is indeed Santa Claus.