Lee and artist Jack Kirby then introduced their comic book version of Willie Lumpkin in Fantastic Four #11 (February, 1963). The comic book Lumpkin is depicted as significantly older than in the comic strip, though the character's good nature was retained, as were references to his past as a mailman in Glenville, which the comic book located in Nebraska.
In his first comic book appearance, Lumpkin is represented as having befriended the Fantastic Four, to whom he makes regular fan mail deliveries at their Baxter Building headquarters in New York City. He half-jokingly requests to join the team on the grounds that he has the "power" to wiggle his ears. He serves as their mailman for many years, and on occasion falls into the zone of danger that typically surrounds the adventuring heroes. Examples include a story in which he is forced to spend Christmas Eve locked in a closet while the Fantastic Four fight the Super-Skrull, when he helped to save the team from the Mad Thinker, or when he is mind-controlled into accessing Doctor Doom's time machine by a minion of Immortus. An alien Skrull also impersonates him in another story to infiltrate the Fantastic Four's headquarters. Willie Lumpkin also crossed over into Spider-Man comics, where he briefly dates Spider-Man's Aunt May.
Willie Lumpkin appeared in his own solo feature in Marvel Comics Presents #18 (May, 1989). The fan-favorite story was a parody of A Christmas Carol in which Lumpkin is visited by the Ghost of Christmas Past, who had intended to haunt cantankerous Spider-Man nemesis J. Jonah Jameson but couldn't find his address. The story concludes with the normally amiable postman deciding that he hates Christmas.
Willie has since retired, and his niece Billie has taken his position as the Fantastic Four's mail carrier.
Willie appears in Fantastic Four #543, being interviewed about the FF on the news show 'Lateline'. He talks about how, though the group took on cosmic menaces, they always found time to greet him.