Current known or inhabited Earths are not all specifically named in the Worm Universe. As of Arc 28, there were over a dozen Earths accessible from Earth Bet. Some contacted worlds are unknown to the general public and were classified.
There are many, many Earths that are not easily accessible. Each Shard resides on another Earth (or multiple Earths), linked through the dimensions.
Earth Aleph is the home to the Travelers. It is a world that diverged paths from the time of Scion's first appearance. This world has variations of everyone born before said appearance (about 30 years before the start of Worm), though anyone born after may not have a duplicate in Earth Bet. It is much closer to the world of the readers than other Earths, even Earth Bet, but it still has capes. However, they're much weaker than the ones on Earth Bet.
Earth Bet, also known as Earth B, is the main location of the story. It is believed to have diverged from Earth Aleph around 1983. It is the home world to Taylor and the majority of the other capes in the story.
Has dollar coins instead of bills, major terrorist attacks did not occur here, but the damage that people with superpowers did more than compensated. The cold war fizzled out when Scion entered the picture and interfered with nuclear weapons testing. There are also the remains of an abandoned base on the Moon that was being created by Sphere. 
Earth Gimel is an alternate Earth connected to Brockton Bay Bet, which seemed to have diverged from other human occupied earths roughly five thousand years ago. It was an underpopulated world and is used to evacuate for much of the East Coast.
Earth Dalet Edit
Earth He is an alternate Earth used to evacuate Western Europe and Northern Africa minus the English speakers.
A world dedicated to Australian refugees, with a population of just over two million people. The largest settlement was attacked by the Yàngbǎn with the intent of conquering the planet for the Chinese Union-Imperial, but their attacking force was annihilated by the Simurgh.
Earth Zayin is an alternate Earth used as a refuge. Sleeper followed into this world and would later "subsume" it. The very fact that he entered Zayin causes everyone else to write off the whole dimension as a lost cause.
Other Refugee WorldsEdit
Also colonized as of Golden Morning were a South American world that had their main settlement obliterated by Zion, and an unnamed world conquered by the Chinese Union-Imperial and used as their base. There were over a dozen worlds colonized from Earth Bet at this point.
Earth C Edit
Earth Samech Edit
Earth Samech or Earth Samekh is a Cauldron controlled earth.
Earth Shin Edit
Full Article: Supreme Earth.
Sometimes known as Earth S. A world with parahumans, but no superheroes. Non-powered people are treated like second-class citizens. There was a takeover on a global level by supervillians, a group called 'The Supreme'. Said villains are very well organized by their leader: Goddess.
The world Fortuna was home to. Eden's crash-landing tore a hole into this world, allowing her to cross over and encounter Eden directly. This world seemed to have a very low level of technology, and Fortuna was unaware that people with dark skin existed.
Doctor Mother's WorldEdit
The Earth where Eden crash-landed, tearing holes to Contessa's World and Doctor Mother's World. Cauldron constructed their compound around her in Côte d’Ivoire. This world featured a number of monsters created by Eden's corpse.
- The Earths within the Worm Universe are mostly named after the letters in the Hebrew alphabet.
- The known Earths are 1, 2, 3, 4, 5 and 7, implying there is at least an Earth Vav (6).