Realms or Dimensions are different planes of existence in all of creation. Most of the realms were created by God. The realm primarily seen is the The Universe. The other realms created by him consist of Heaven and Purgatory in that order which were created by God. On top of this God also created several other universes. However, Avalon, the Empty, and Hell's creator are unknown.
- Main/Prime Universe
- The French Mistake Universe
- Apocalypse World
- The Bad Place
- Yokoth and Glythur's World
The domain of demons and souls sent there through the power of the deals or through a sinful life. This realm houses hordes of dark souls and entities like the Shedim and the Whore of Babylon. In its furthest reaches, is Limbo which has Lucifer's Cage, which primarily held the fallen archangel Lucifer, but also at one point held his true vessel Sam Winchester, and the archangel Michael along with his secondary vessel Adam Milligan.
A realm where Reapers can send souls, rather than Hell or Heaven. It is inhabited by deceased Angels and Demons and is ruled by the Shadow. It has been stated that the Empty was the first realm in existence, prior even to God and the Darkness, who apparently have no power there.
Scooby Doo Universe
A Realm where the Scooby Gang resides. It takes on the appearance of a cartoon. Physics can be bent in this world. Known species to inhabit it include Humans and Talking Dogs.
Deities Realm (Non-Canon)
Mentioned in Supernatural: Coyote's Kiss, is the homeworld of Huehuecoyotl and other deities, once, a woman who tried to enter in this realm along with Huehuecoyotl, was somehow transformed and became the first Borderwalker.
- Of the realms seen Hell is the only one seen in a dark demeanor reflecting its purpose as a place of torture.
- Earth and Purgatory are the only known realms where everything is tangible and existent. Avalon is unseen and Heaven and Hell are mostly memory reflections or illusions of torture and pain.
- Dean Winchester is the only known being to have been to all realms of existence (except The Empty), while Sam, Castiel and Bobby have been to all but Avalon.
- Castiel has been the only being so far, to been shown to have come back from The Empty after he demanded to The Shadow to release him.
- This was later confirmed in Byzantium, where it is stated that he is the only being to ever escape.
- Heaven and Purgatory are the oldest of the realms, followed by either or Earth and then Hell. Paradise existed, soon chaos rolled in, and then when evil came Damnation was created.
- The Earth realm has the most beings walk through it; Purgatory and Hell being second with, monsters, demons, humans, and reapers/Horsemen. Heaven has the least with the least angels, humans, and Horsemen.
- Given that the Shadow, the ruler of the Empty, has stated that not even God has power there, it is unclear how God managed to resurrect Castiel so many times.