The origins of Poptropolis is unknown, but it most likely may have been the birthplace of all eight tribes of Poptropica. As of January 24, 2013, the island has sunk back into the sea. However on it was re-released for everyone on June 14, 2013.
The city has a Greek-Roman type of archictecture, similar to Mythology Island. It is also apparent based on some of the ancient clothes that some organizers of the games wear. Ancient Poptropolis resident's were probably brilliant architects, made known by the huge statues that decorate the Poptropolis Games courses.
- Poptropolis is mentioned on a science magazine cover in Night Watch Island.