The game's userbase maintains a number of communities across the internet, created by Paradox Interactive and by fans themselves
Paradox Interactive has its own official forum. The forum is divided into subforums based on games.
- Paradox Interactive's EU4 forum
- Twitch channel where developers discuss upcoming updates and content
- Youtube channel where developers discuss upcoming updates, content and community members can contribute with spotlights, tutorials or playthroughs
The unofficial community often hosts various events and multiplayer games. Members of /r/ParadoxPlaza (subreddit on reddit) often post content like AARs, bug reports, and strategy guides as a form of entertainment. Paradox Interactive staff also frequent the site on a regular basis.
- /r/Paradoxplaza, one of the largest third-party communities around, located on Reddit. They have approximately 186.000 subscribers as of 03-12-2020.
- /r/eu4, another subreddit dedicated to Europa Universalis IV, which also features content such as AARs, bug reports and strategy guides.
- /r/CrusaderKings/, a third subreddit dedicated to Crusader Kings II, which as well as the other ones features content such as AARs, bug reports and strategy guides.
- /r/Victoria2/, a fourth subreddit dedicated to Victoria 2, which mainly features AARs and a nice place to ask questions about the game.