* Official versions: Hasbro, the current owner of Monopoly, has released countless official versions with different themes, locations, and gameplay rules. There are city-specific editions, themed versions (like Star Wars or Marvel), and even editions tied to popular TV shows or movies.
* Unofficial variations: Countless individuals and groups have created their own custom Monopoly boards and rules. These can range from simple modifications to completely new game mechanics.
* Constant releases: Hasbro continues to release new versions of Monopoly regularly.
Instead of a number, it's safer to say there are hundreds, if not thousands, of Monopoly variations.
If you're interested in finding specific versions, you can search online retailers or explore websites dedicated to board game enthusiasts.