Here's an unoffical list of the 52 universes (Earths) that exist in the DC Universe. No doubt it'll all change with the upcoming Final Crisis.
If any one had any updates or changes let us know and finally, as Starman (JSA #10) says "we (can) have a map for these kinds of things".
Earth-0: New Earth. Created in Infinite Crisis #6 Earth-1: Unknown at this time. Mentioned by Rip Hunter 52 #52 Earth-2: Home of the Justice Society of America. Revealed in 52 #52 Earth-3: Home of the Crime Society of America. Revealed in 52 #52 Earth-4: Home of the former Charlton Heroes. Revealed in 52 #52 Earth-5: Home of the Marvel Family. Revealed in 52 #52 Earth-6: ? Earth-7: ? Earth-8: Home of the Extremists. Revealed in Countdown #29 Earth-9: ? Earth-10: Home of the Freedom Fighters. Revealed in 52 #52 Earth-11: ? Earth-12: Home of Batman Beyond and, presumably, DC's animated characters. Mentioned, but not yet shown. Earth-13: Home of the Vertigo characters. Sort of (?). Mentioned, but not yet shown. Earth-14: ? Earth-15: An Earth where the heroes have evolved to become nearly perfect beings. Revealed in Countdown #30 Earth-16: ? Earth-17: Home of the Atomic Knights and, presumably, Kamandi. Revealed in 52 #52 Earth-18: Home of the Justice Riders. Mentioned, but not yet shown. Earth-19: Home of the Victorian era Batman. Revealed in Countdown #40 Earth-20: ? Earth-21: Home of the New Frontier characters. Mentioned, but not yet shown. Earth-22: Home of the Kingdom Come characters. Revealed in 52 #52 Earth-23: ? Earth-24: ? Earth-25: ? Earth-26: Home of Captain Carrot and the Zoo Crew. Revealed in Captain Carrot & His Amazing Zoo Crew: The Final Ark #1. Earth-27: ? Earth-28: ? Earth-29: ? Earth-30: Home of the Russian Superman. Revealed in Countdown #40 Earth-31:Home of a darker version of the future, (Dark Knight Returns!?!). Mentioned, but not yet shown. Earth-32:Home of Bruce Wayne/Green Lantern. Mentioned, but not yet shown. Earth-33: The Conjurer's World. Home of magical versions of DC characters, including Bat-Mage, Kal-El & Lady Flash. Revealed in Countdown to Adventure #3. Earth-34:Home of a 19th Century Wonder Woman and a Britain run by Jack The Ripper. Mentioned, but not yet shown. Earth-35: ? Earth-36: ? Earth-37: ? Earth-38: ? Earth-39: ? Earth-40: Home of WWII Covert Agents, The Unholy Three. Mentioned, but not yet shown. Earth-41: ? Earth-42: ? Earth-43: Home of the Vampire Batman. Revealed in Countdown #40 Earth-44: ? Earth-45: ? Earth-46: ? Earth-47: ? Earth-48: Home of the Forerunners. Revealed in Countdown to Adventure#1 Earth-49: ? Earth-50: Home of the Wildstorm characters. Revealed in 52 #52 Earth-51: ?
Earth-52: Home of one-dimensional, boring, stuck-in-the-silver-age characters, whose life stories have been overtaken by annual "big events" drawn by mediocre artists.
