Many on-line communities exist for the discussion of City of Heroes. Some prominent ones include:
Official forums
The official Internet forum for City of Heroes is the web board found at boards.cityofheroes.com. This web board is run by NCsoft themselves, and frequented by various developers and customer service representatives (referred to by site regulars as "red names" because their usernames are highlighted in red on their forum posts) as well as players. There are forums devoted to announcements, general issues, player guides, questions, suggestions, each archetype, each of the eleven game servers, City of Villains, and other topics.
The European version of City of Heroes has its own separate official web board.
Supergroups
A player can join an existing Supergroup (also known as a "guild" in other MMOs) at any level. When the player reaches Level 10, the player may register a Supergroup of their own creation. When in a Supergroup the player can edit his or her colors and emblem to match the group. Also, if the player is in "Supergroup Mode", the player will earn Prestige and Salvage for the group. These can be used to improve the player's group's Base as well as paying rent on said base. Originally, the game did not have bases for heroes to inhabit between battles, but with the release of City of Villains, the feature was enabled for those who owned both games. The concept of a Supergroup in the game is clearly based on similar groups existing in comics such as Marvel Comics' Avengers or DC Comics' Justice League of America. Likewise, the idea of superhero bases comes from the concept of the headquarters of superhero groups, such as Avengers Mansion, the Baxter Building/Four Freedoms Plaza and the JLA Watchtower.
Fan sites
Numerous City of Heroes fan sites exist with a wide variety of formats and purposes, including roleplaying sites and informational sites. NCsoft maintained a City of Heroes fansite portal on its official site (indefinitely out of order at this current time). When operative, any person may create a fan site and submit it to NCsoft for publication on the portal, pending review to ensure that the site meets with the guidelines for a fan site submission.