How many people in the world play World of Warcraft?

There are over 11 million subscriptions to World of Warcraft at the moment.

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Actually to date Blizzard just hit 12,000,000 (12 million) subscribers for World of Warcraft. The population keeps growing.

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Yes that's from October 2010 (just to add a bit of context)

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less than w101(w101 is not a glitch with my computer)