Earth

The Earth is a planet created solely by God that respectively supports a large variety of life, including bacteria, humans creatures, and animals. The planet is nearly 5 billion years old and is located in the Solar System, within the Milky Way Galaxy. Entities like angels and demons can manifest on Earth via possession in the use of vessels. Others can appear physically by assuming human form.

The archangels wanted to wage war over Earth, Michael and Raphael to generate paradise - at the cost of destroying half the planet, and Lucifer wanted to purge it of its "filth": humans. This came to be known as the Apocalypse which, had it been successful, would have nearly destroyed the planet.

Between the years 2011-2012, the Leviathans planned to take over Earth and harvest humans as cattle. They nearly succeed, but are defeated when Dean Winchester and the angel Castiel kill their leader. Without their leader, they fell into disarray and were hunted off.

In 2015, a primordial evil known only as the Darkness that existed even before the Earth itself, is released into the world when the Mark of Cain is destroyed.

Known rulers

 * God - He created mankind and Earth, but hasn't had a hand in ruling the Earth for some time, but according to rumors, He's somewhere on Earth.
 * Pagan gods - According to Kali, their religions were practiced before that of God's.
 * Castiel (temporarily) - After absorbing all of Purgatory's souls, he became the supposed ruler of the Universe.
 * Archangels see themselves as the top power and authority over creation since God's departure and manage both Heaven and Earth.
 * Michael - As the oldest archangel and viceroy of Heaven, he should had ruled over creation until his imprisonment.
 * Lucifer (alternate future) - In an alternate future (set in 2014) shown to Dean by Zachariah, Lucifer had conquered the Earth with his armies of demons and Croatoan zombies.
 * Leviathans (alternate future) - In another alternate future described by Chronos, it is implied that the Earth is overrun by the Leviathans. This was averted when the leader of the Leviathans was killed, effectively defeating the Leviathans. They also ruled Earth before God had trapped them in Purgatory.

Inhabitants

 * Humans: The dominant species on the planet. They are often considered as one of the greatest creation of God, and unlike angels and demons, they are neutral in the Heaven-Hell War, not including hunters like the Winchester Family. Though many humans worship God and believe in the existence of Heaven and Hell and in the supernatural, most remain unaware of the many supernatural entities roaming the planet.
 * Jesus (temporarily) - Many humans believe Jesus was sent to Earth by God to save humanity, as is mentioned by Rick in ...And Then There Were None. Not much is known about the Jesus's history on Earth, but according to Eve and history he was just a human and not a son of God.
 * Animals: There are thousands of billions of species of animals and creatures that live in the world. Unfortunately, some of these animals have been driven to extinction by humans or natural causes.
 * Death: Normally kept restrained 600 ft under the Earth's crust, but is currently free due to Lucifer's spell.
 * Reapers: Tasked with guiding (sometimes forcibly) the souls of recently deceased humans to the afterlife.
 * Monsters: The creations of Eve, these monsters live on the Earth, often preying on humans. They keep their existence secret by hiding themselves or posing as humans.
 * Leviathans: Among the earliest creations of God, once sealed in the realm Purgatory are now released and are on Earth.
 * Angels: After Metatron cast a spell that expelled them from Heaven, all angels fell to Earth. Now with Metatron locked in Heaven's dungeon, it is likely that the angels returned to their home through the portal.
 * Ghosts: Spirits of deceased humans that have refused to leave Earth for whatever reason. With Heaven sealed, all the spirits of those who are supposed to go to Heaven are trapped on the Earth in the Veil. This has been corrected with Heaven being retaken however.
 * Demons: Most demons roam the earth harming and possessing people.
 * The Darkness: Released onto the Earth when the Mark of Cain was destroyed.

Trivia

 * In The French Mistake, the Alternate Earth was created by the Big Bang rather than through a God and the magic within this world was so weak that it was virtually non-existent.