Earth Prime: Earth based closest on the real world Earth, with only Superboy-Prime as its sole existing hero.
Earth-0 (New Earth): The Earth existing in the primary reality following the Infinite Crisis and Final Crisis events. As all other universes are based and dependant on this Earth if this Earth is destroyed the entire multiverse will be destroyed.
Earth-1: This Earth is defended by characters of the graphic novels Superman: Earth One and Batman: Earth One.
Earth-2: A slightly altered version of the JSA fight the Axis powers in WWII. This Earth is later defended by Justice Society Infinity, a successive version of the JSA whose members include Batman's daughter, the Huntress, and an older Robin. Reminiscent of Pre-Crisis Earth-Two.
Earth-3: On this moral mirror image of New Earth, the Crime Society of Ultraman (Superman), Owlman (Batman), Superwoman (Lois Lane), Power Ring (Green Lantern) and Johnny Quick (Flash) rule with an iron hand, while rogue do-gooders like the Jokester (Joker) fight for freedom. The Joker’s Daughter came from this universe.
Earth-4: Blue Beetle, Captain Atom, Judomaster, Nightshade, the Peacemaker and the Question are the heroes of this Earth. Reminiscent of Pre-Crisis Earth-Four.
Earth-5: The Marvel Family are this Earth's main heroes in a bright, sunny world of magic. Reminiscent of Pre-Crisis Earth-S.
Earth-6: World including version of Ray Palmer who becomes The Ray. This Earth contains heroes similar to those of Marvel Comics. This universe is overseen by the Monitor Weeja Dell.
Earth-7: World including version of Courtney Whitmore who becomes known as Starwoman.
Earth-8: Home world of Lord Havok and the Extremists with no hero analogues. Earth is called Angor, home of Lord Havok's Extremists. Modeled after the Marvel universe, and of the planet Angor on New Earth, home of the original Extremists and Justifiers. This universe is overseen by the Monitor Solomon.
Earth-9: Tangent Universe. Heroes bare familiar names, but the similarities end there. Here, Superman is Harvey Dent and takes over the entire planet.
Earth-10: In the Earth Adolph Hitler achieved victory in World War II and conquered the planet. Alternate versions of Uncle Sam and the Freedom Fighters plot to end his reign while fighting Nazi counterparts of the JLA.
Earth-11: A reverse gender Earth.
Earth-12: The Timmverse; a universe filled with parallel versions of Earth’s heroes whose adventures are advertised in numerous animated shows (Batman: The Animated Series, Superman: The Animated Series, The New Adventures of Batman and Robin, Justice League, Justice League Unlimited, Batman Beyond, etc).
Earth-13: World of dark and arcane heroes.
Earth-15: A Earth whose people have evolved to become 'nearly perfect beings' of their own personal development. Heroes included Jason Todd as Batman, Jessica Palmer as the Atom, Donna Troy as Wonder Woman and Zod and Christopher Kent as dual Supermen. Earth-15 was completely destroyed by Kal-El (Earth-Prime). The source dimension and other inhabited planets of that dimension continue to exist.
Earth-16: Home of the Super-Sons. Source Earth of Christopher Kent the alternate Superman. Once designated to be the Source Earth of the 52 multiverse version of The Supersons, but is has been revealed that there are no other Kryptonian relatives to Christopher Kent in this reality. Also the home of the Young Justice animated series and its comic counterpart.
Earth-17: A post-apocalyptic world where the Atomic Knights protect the last signs of life. On this Earth, science and magic apparently co-exist - this Earth's greatest hero is Superdemon
Earth-18: A world where the JLA are a group of lawmen who ride the Wild West.
Earth-19: Gotham by Gaslight reality; Batman fights Jack the Ripper among other villains in this Victorian-era Gotham lit by gaslight in the closing decades of the 19th century.
Earth-20: Home to a group of pulp-inspired heroes, the Society of Super-Heroes, led by Doc Fate
Earth-21: The New Frontier reality; a world where the Cold War has recently ended and a new age of heroes has begun. This Earth is where the core heroes became famous during the 1950’s and 60’s.
Earth-22: The Kingdom Come reality; A near-future world brought to the brink of apocalypse by warring superheroes. Starman confirms that before he came back to the 21st Century during the Lightning Saga, he was accidently shunted to Earth-22. Superman from this world now lives on New Earth and is a member of the JSA. He claims that his world was destroyed.
Earth-26: Home of the cartoon animal superheroes Captain Carrot & The Zoo Crew.
Earth-30: The Red Son reality; where baby Kal-El landed in the Soviet Union during the Cold War of the 1950’s. A champion of Soviet Russia Superman helps Russia to dominate the globe.
Earth-31: The Millerverse; Earth’s heroes are led by a pro-government, all-American Superman and a violent Batman. Wonder Woman is also an extremely anti-male feminist.
Earth-32: Bruce Wayne becomes Green Lantern instead of Hal Jordan.
Earth-33: A mystical earth where all of the heroes have magic-based powers, including Bat-Mage, and Kal-El, wielder of Kryptonian Magicks. Ruled by the multiversal seer Oracle.
Earth-34: The Amazonia reality; Princess Diana is kidnapped from Paradise Island by Captain Steven Trevor and the Royal Marines before becoming a hero, Wonder Woman, in 19th century London and frees Britain from male-dominant oppression under the reign of King Jack (Jack the Ripper).
Earth-37: Thrillkiller Universe. Barbara Gordon becomes Gotham's foremost costumed protector, and Bruce Wayne is a cop. Its Captain Atom was Quantum-Storm.
Earth-38: Homeworld to a Captain Atom who leads the Atomic Knights.
Earth-39: Homeworld of Daniel Garrett who became Blue Beetle the same way as Jamie Reyes.
Earth-40: The Liberty Files world, where costumed heroes and villains have joined World War II.
Earth-43: Batman Vampire, Red Rain universe; A world of vampires and the supernatural, inhabited by a vampire Batman. Dick Grayson tried to take him down, but succumbed to Batman's contagion and is now, too, a vampire. Barbara Gordon was also transformed, but killed by Grayson.
Earth-44: Unknown, but it's main heroes were a group of robots called the Metal Men, led by "Doc Tornado"
Earth-48: This universes Earth is used as a neutral warring ground for Martians, Venusians and other alien species in the solar system. The cross-bred survivors of Earth have evolved to become the Forerunners; elite killing machines in the service of the Monitors. This universe's counterpart of J'onn J'onzz is a general in the Martian army.
Earth-49: An Earth who's sun has been turned into a Red Sun by Firestorm. Superman, Supergirl and other heroes that need the sun's yellow rays must wear suits identical to Superboy-Prime's.
Earth-50: The Wildstorm Universe. Heroes include WildC.A.T.S., the Authority and Gen13.
Earth-51: Due to this Earth's Batman secretly killing irredeemable villains after the death of Jason Todd, this Earth is described as a near perfect world. With no mention of crime, war, poverty or disease. Now home of the former gods of New Genesis and Kamandi (Jack Kirby's Earth). This Earth began very similar to Earth-0. The Justice League eventually triumphed over all evil and created a peaceful society. Most of them retired. When the Atom of Earth-0 came across his Earth-51 counterpart, he witnessed the latter's death. Earth-0 Ray decided to take up Ray-51's life, which included a happy marriage to Jean Loring, and a science project that would allow him to travel across the multiverse. All life on this world was destroyed when Superboy Prime breached Monarch's containment suit (Countdown #13). Afterwards, its monitor, Nix Uotan, remade humanity. But it was doomed again, as the site of the "Great Disaster." Brother Eye came to Earth-51 and unleashed the Morticoccus virus (also spread by Karate Kid). The only human survivors were Buddy Blank and his grandson, the "last boy on Earth," who becomes Kamandi. This is the setting for DC's 1970s titles OMAC and Kamandi.