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
Paradox Interactive also runs multiple discord servers. Some of their games have their own server, but europa universalis doesn't and uses the Paradox Interactive server instead.
-  the official Paradox Interactive Discord Server
The Leaderboard was an official feature allowing players to upload score results from an Ironman game to the official website. The leaderboard has been discontinued.
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 226.000 subscribers as of 01-12-2022.
- /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.
- Paradox Community, an unofficial discord for fans of Paradox games to gather, discuss the games and run MP campaigns.