Board Thread:General Discussion/@comment-1031179-20151003030810/@comment-1031179-20151009165248

I got a message back from them.

Hi Dream Focus,

It's true that we're currently involved in a FanStudio program with the Civilization wikia. That just means that Wikia is collaborating with the company behind the game for marketing purposes. Similar collaborations are planned for Deux Ex, Rainbow Six Siege, and Battleborn.

Those collaborations only run for a certain period of time, and change often, though, so there isn't really a list of "official" wikias, and no set number.