Earth-68

Earth 68 is the Earth that appears in the majority of all dimensions in Dioga beta. Some dimensions in this media don't live on an actual Earth. Each dimension has its own form of John Smith.

Dimension 1
Dimension 1 is the dimension of John Smith, and the origin dimension of the John Smith 10 franchise. It is the prime dimension that is hosted in most John Smith 10 media. This dimension has its own Null Void dimension and Ledgerdomain. This dimension has a John 10,000.

Dimension 1 1/2
Dimension 1 1/2 is the prime dimension starting with John Smith 10: Phantom Watch. After the arrival of Phantom in the dimension, it caused a rip in time and space, divulging the prime dimension into two. John Prime returned to this dimension, making it the new prime dimension. Due to this tear, several more godlike monsters were awakened by either Phantom or the space time tear. Such examples are Prometheus, Solaris and Gaia. There is no known John 10,000, due to the future being undetermined.

Dimension 777
Dimension 777 is the dimension that the spin off series John Smith 10: Final Fantasy occurs. The dimension was created when Super John and Silver Surfer collided inside Galactus. This dimension takes the characters from the prime dimension and places them into the story of Final Fantasy 7. John Prime is the John there, as it was created by his thoughts. It is unknown what happened to the dimension after John left it.

Dimension 12
Dimension 12 is the Naruto dimension that appears in John Smith 10: Distant Worlds. This Earth is populated by ninjas. The John in this dimension is a Ninja version of Eon. It is numbered 12 in response to the "Leaf 12."

Dimension 22
Dimension 22 is the One Piece dimension that appears in Distant Worlds. This Earth has a series of islands, a world where Pirates overrun the world and they battle against the Marines. The John of this dimension is Dr. John, who is a Marine scientist. He ate the Alien Alien Fruit, allowing him to transform into an alien with a large head and tentacles for a body. It is numbered 22 due to the 22 years after Gold Roger's death from when the manga One Piece started.

Dimension 10-X
Dimension 10-X is the X-Men dimension, filled with mutants. This dimension connects to its own Ledgedomain, the world of MÄR Heaven. John doesn't have an alternate form in the main dimension, but his alternate counterpart lives in MÄR Heaven, named Phantom.

Dimension 37
Dimension 37 is the dimension of the Teen Titans. This dimension doesn't have a known John Smith.

Dimension 4
Dimension 4 is the dimension of the Avatar: The Last Airbender and The Legend of Korra dimension. This dimension technically has no version of John, though it could be argued that the Avatar is his re-incarnation. It is numbered 4 due to the four elements.

Dimension 10
Dimension 10 is the dimension where Ben Tennyson lives. This dimension is an exact replica of the Earth-10 of the canon series. There is no John here due to Ben having the Omnitrix instead.

This dimension is also the dimension for the movie Little Red Headed Girl, which occurs

Dimension 13
Dimension 13 is the dimension of the Kingdom Hearts worlds. This dimension has no Earth, but is made up of several Disney worlds. While initially having no John alternate form, Phantom X and Darkside were created when John lost his heart. Kairi takes over as his variation afterwards due to her sharing his powers.

Dimension 2
Dimension 2 is the dimension for the spin off series Ryder 10. The John variation is Ryder, who's full name is Jonathan Ray Smith. He is a motorcyclist, and he travels the country fighting evil.

Dimension 3
Dimension 3 is the dimension for the spin off series Jane Smith 10. The John variation is Jane Smith, the first known female variant.

Dimension 720
This dimension is dimension for the movie Little Red Headed Girl, which occurs in a dimension of Ben 10,000. Samurai, daughter of Ben 10,000, is forced to live in a conquered world. She eventually is forced to join the fight and saves the world. This dimension has Ben instead of John.

Dimension 216
Dimension 216 is the dimension of the movie Argit 10. This has an Argit that wields the Omnitrix. A John variation has not appeared yet.

Trivia

 * This list puts the dimensions in debut order, except the ones where John Prime is the main John, specifically the split dimensions.
 * John variations that come from other series other than Ben 10 do not have Omnitrices.
 * There are plans for a John 23 and a Mad John dimension.